diff --git a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisSet.java b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisSet.java
index 1b0c6f331..f244a5cac 100644
--- a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisSet.java
+++ b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisSet.java
@@ -67,34 +67,34 @@ public class DefaultRedisSet<E> extends AbstractRedisCollection<E> implements Re
 	}
 
 	@Override
-	public Set<E> diff(Collection<RedisSet<? extends E>> sets) {
+	public Set<E> diff(Collection<? extends RedisSet<?>> sets) {
 		return boundSetOps.diff(CollectionUtils.extractKeys(sets));
 	}
 
 	@Override
-	public RedisSet<E> diffAndStore(String destKey, Collection<RedisSet<? extends E>> sets) {
+	public RedisSet<E> diffAndStore(String destKey, Collection<? extends RedisSet<?>> sets) {
 		boundSetOps.diffAndStore(destKey, CollectionUtils.extractKeys(sets));
 		return new DefaultRedisSet<E>(boundSetOps.getOperations().forSet(destKey));
 	}
 
 	@Override
-	public Set<E> intersect(Collection<RedisSet<? extends E>> sets) {
+	public Set<E> intersect(Collection<? extends RedisSet<?>> sets) {
 		return boundSetOps.intersect(CollectionUtils.extractKeys(sets));
 	}
 
 	@Override
-	public RedisSet<E> intersectAndStore(String destKey, Collection<RedisSet<? extends E>> sets) {
+	public RedisSet<E> intersectAndStore(String destKey, Collection<? extends RedisSet<?>> sets) {
 		boundSetOps.intersectAndStore(destKey, CollectionUtils.extractKeys(sets));
 		return new DefaultRedisSet<E>(boundSetOps.getOperations().forSet(destKey));
 	}
 
 	@Override
-	public Set<E> union(Collection<RedisSet<? extends E>> sets) {
+	public Set<E> union(Collection<? extends RedisSet<?>> sets) {
 		return boundSetOps.union(CollectionUtils.extractKeys(sets));
 	}
 
 	@Override
-	public RedisSet<E> unionAndStore(String destKey, Collection<RedisSet<? extends E>> sets) {
+	public RedisSet<E> unionAndStore(String destKey, Collection<? extends RedisSet<?>> sets) {
 		boundSetOps.unionAndStore(destKey, CollectionUtils.extractKeys(sets));
 		return new DefaultRedisSet<E>(boundSetOps.getOperations().forSet(destKey));
 	}
diff --git a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisZSet.java b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisZSet.java
index c2cf4f095..243a65131 100644
--- a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisZSet.java
+++ b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/DefaultRedisZSet.java
@@ -91,7 +91,7 @@ public class DefaultRedisZSet<E> extends AbstractRedisCollection<E> implements R
 	}
 
 	@Override
-	public RedisZSet<E> intersectAndStore(String destKey, Collection<RedisZSet<? extends E>> sets) {
+	public RedisZSet<E> intersectAndStore(String destKey, Collection<? extends RedisZSet<?>> sets) {
 		boundZSetOps.intersectAndStore(destKey, CollectionUtils.extractKeys(sets));
 		return new DefaultRedisZSet<E>(boundZSetOps.getOperations().forZSet(destKey), getDefaultScore());
 	}
@@ -124,7 +124,7 @@ public class DefaultRedisZSet<E> extends AbstractRedisCollection<E> implements R
 	}
 
 	@Override
-	public RedisZSet<E> unionAndStore(String destKey, Collection<RedisZSet<? extends E>> sets) {
+	public RedisZSet<E> unionAndStore(String destKey, Collection<? extends RedisZSet<?>> sets) {
 		boundZSetOps.unionAndStore(destKey, CollectionUtils.extractKeys(sets));
 		return new DefaultRedisZSet<E>(boundZSetOps.getOperations().forZSet(destKey), getDefaultScore());
 	}
diff --git a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisSet.java b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisSet.java
index 21b13bb73..a38d20280 100644
--- a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisSet.java
+++ b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisSet.java
@@ -26,15 +26,15 @@ import java.util.Set;
  */
 public interface RedisSet<E> extends RedisStore<String>, Set<E> {
 
-	Set<E> intersect(Collection<RedisSet<? extends E>> sets);
+	Set<E> intersect(Collection<? extends RedisSet<?>> sets);
 
-	Set<E> union(Collection<RedisSet<? extends E>> sets);
+	Set<E> union(Collection<? extends RedisSet<?>> sets);
 
-	Set<E> diff(Collection<RedisSet<? extends E>> sets);
+	Set<E> diff(Collection<? extends RedisSet<?>> sets);
 
-	RedisSet<E> intersectAndStore(String destKey, Collection<RedisSet<? extends E>> sets);
+	RedisSet<E> intersectAndStore(String destKey, Collection<? extends RedisSet<?>> sets);
 
-	RedisSet<E> unionAndStore(String destKey, Collection<RedisSet<? extends E>> sets);
+	RedisSet<E> unionAndStore(String destKey, Collection<? extends RedisSet<?>> sets);
 
-	RedisSet<E> diffAndStore(String destKey, Collection<RedisSet<? extends E>> sets);
+	RedisSet<E> diffAndStore(String destKey, Collection<? extends RedisSet<?>> sets);
 }
diff --git a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisZSet.java b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisZSet.java
index 8a67bd936..bcc17fe6f 100644
--- a/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisZSet.java
+++ b/spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/support/collections/RedisZSet.java
@@ -29,9 +29,9 @@ import java.util.SortedSet;
  */
 public interface RedisZSet<E> extends RedisStore<String>, Set<E> {
 
-	RedisZSet<E> intersectAndStore(String destKey, Collection<RedisZSet<? extends E>> sets);
+	RedisZSet<E> intersectAndStore(String destKey, Collection<? extends RedisZSet<?>> sets);
 
-	RedisZSet<E> unionAndStore(String destKey, Collection<RedisZSet<? extends E>> sets);
+	RedisZSet<E> unionAndStore(String destKey, Collection<? extends RedisZSet<?>> sets);
 
 	Set<E> range(long start, long end);
 
diff --git a/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisSetTests.java b/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisSetTests.java
index 483a846d3..c8ca6f707 100644
--- a/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisSetTests.java
+++ b/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisSetTests.java
@@ -29,8 +29,6 @@ import org.junit.Before;
 import org.junit.Test;
 import org.springframework.data.keyvalue.redis.core.BoundSetOperations;
 import org.springframework.data.keyvalue.redis.core.RedisTemplate;
-import org.springframework.data.keyvalue.redis.support.collections.DefaultRedisSet;
-import org.springframework.data.keyvalue.redis.support.collections.RedisSet;
 
 /**
  * Integration test for Redis set.
@@ -80,7 +78,7 @@ public abstract class AbstractRedisSetTests<T> extends AbstractRedisCollectionTe
 		diffSet1.add(t2);
 		diffSet2.add(t3);
 
-		Set<T> diff = set.diff(diffSet1, diffSet2);
+		Set<T> diff = set.diff(Arrays.asList(diffSet1, diffSet2));
 		assertEquals(1, diff.size());
 		assertThat(diff, hasItem(t1));
 	}
@@ -104,7 +102,7 @@ public abstract class AbstractRedisSetTests<T> extends AbstractRedisCollectionTe
 		diffSet2.add(t4);
 
 		String resultName = "test:set:diff:result:1";
-		RedisSet<T> diff = set.diffAndStore(resultName, diffSet1, diffSet2);
+		RedisSet<T> diff = set.diffAndStore(resultName, Arrays.asList(diffSet1, diffSet2));
 
 		assertEquals(1, diff.size());
 		assertThat(diff, hasItem(t1));
@@ -130,7 +128,7 @@ public abstract class AbstractRedisSetTests<T> extends AbstractRedisCollectionTe
 		intSet2.add(t2);
 		intSet2.add(t3);
 
-		Set<T> inter = set.intersect(intSet1, intSet2);
+		Set<T> inter = set.intersect(Arrays.asList(intSet1, intSet2));
 		assertEquals(1, inter.size());
 		assertThat(inter, hasItem(t2));
 	}
@@ -155,7 +153,7 @@ public abstract class AbstractRedisSetTests<T> extends AbstractRedisCollectionTe
 		intSet2.add(t3);
 
 		String resultName = "test:set:intersect:result:1";
-		RedisSet<T> inter = set.intersectAndStore(resultName, intSet1, intSet2);
+		RedisSet<T> inter = set.intersectAndStore(resultName, Arrays.asList(intSet1, intSet2));
 		assertEquals(1, inter.size());
 		assertThat(inter, hasItem(t2));
 		assertEquals(resultName, inter.getKey());
@@ -178,7 +176,7 @@ public abstract class AbstractRedisSetTests<T> extends AbstractRedisCollectionTe
 		unionSet1.add(t4);
 		unionSet2.add(t3);
 
-		Set<T> union = set.union(unionSet1, unionSet2);
+		Set<T> union = set.union(Arrays.asList(unionSet1, unionSet2));
 		assertEquals(4, union.size());
 		assertThat(union, hasItems(t1, t2, t3, t4));
 	}
@@ -201,7 +199,7 @@ public abstract class AbstractRedisSetTests<T> extends AbstractRedisCollectionTe
 		unionSet2.add(t3);
 
 		String resultName = "test:set:union:result:1";
-		RedisSet<T> union = set.unionAndStore(resultName, unionSet1, unionSet2);
+		RedisSet<T> union = set.unionAndStore(resultName, Arrays.asList(unionSet1, unionSet2));
 		assertEquals(4, union.size());
 		assertThat(union, hasItems(t1, t2, t3, t4));
 		assertEquals(resultName, union.getKey());
diff --git a/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisZSetTest.java b/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisZSetTest.java
index e0756199f..1e29571d5 100644
--- a/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisZSetTest.java
+++ b/spring-data-redis/src/test/java/org/springframework/data/keyvalue/redis/support/collections/AbstractRedisZSetTest.java
@@ -19,6 +19,7 @@ import static org.junit.Assert.*;
 import static org.junit.Assume.*;
 import static org.junit.matchers.JUnitMatchers.*;
 
+import java.util.Arrays;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
 import java.util.Set;
@@ -27,8 +28,6 @@ import org.junit.Before;
 import org.junit.Test;
 import org.springframework.data.keyvalue.redis.core.BoundZSetOperations;
 import org.springframework.data.keyvalue.redis.core.RedisTemplate;
-import org.springframework.data.keyvalue.redis.support.collections.DefaultRedisZSet;
-import org.springframework.data.keyvalue.redis.support.collections.RedisZSet;
 
 /**
  * Integration test for Redis ZSet.
@@ -208,7 +207,7 @@ public abstract class AbstractRedisZSetTest<T> extends AbstractRedisCollectionTe
 		interSet2.add(t3, 3);
 
 		String resultName = "test:zset:inter:result:1";
-		RedisZSet<T> inter = zSet.intersectAndStore(resultName, interSet1, interSet2);
+		RedisZSet<T> inter = zSet.intersectAndStore(resultName, Arrays.asList(interSet1, interSet2));
 
 		assertEquals(1, inter.size());
 		assertThat(inter, hasItem(t2));
@@ -328,7 +327,7 @@ public abstract class AbstractRedisZSetTest<T> extends AbstractRedisCollectionTe
 		unionSet2.add(t3, 6);
 
 		String resultName = "test:zset:union:result:1";
-		RedisZSet<T> union = zSet.unionAndStore(resultName, unionSet1, unionSet2);
+		RedisZSet<T> union = zSet.unionAndStore(resultName, Arrays.asList(unionSet1, unionSet2));
 		assertEquals(4, union.size());
 		assertThat(union, hasItems(t1, t2, t3, t4));
 		assertEquals(resultName, union.getKey());