diff --git a/src/main/java/org/springframework/data/redis/cache/RedisCache.java b/src/main/java/org/springframework/data/redis/cache/RedisCache.java
index 0fc28869e..888cd8b1e 100644
--- a/src/main/java/org/springframework/data/redis/cache/RedisCache.java
+++ b/src/main/java/org/springframework/data/redis/cache/RedisCache.java
@@ -378,8 +378,12 @@ public class RedisCache implements Cache {
 		protected void maintainKnownKeys(RedisCacheElement element, RedisConnection connection) {
 
 			if (!element.hasKeyPrefix()) {
+
 				connection.zAdd(cacheMetadata.getSetOfKnownKeysKey(), 0, element.getKeyBytes());
-				connection.expire(cacheMetadata.getSetOfKnownKeysKey(), element.getTimeToLive());
+
+				if (!element.isEternal()) {
+					connection.expire(cacheMetadata.getSetOfKnownKeysKey(), element.getTimeToLive());
+				}
 			}
 		}
 
diff --git a/src/test/java/org/springframework/data/redis/cache/RedisCacheUnitTests.java b/src/test/java/org/springframework/data/redis/cache/RedisCacheUnitTests.java
index 8919e648f..f3c010923 100644
--- a/src/test/java/org/springframework/data/redis/cache/RedisCacheUnitTests.java
+++ b/src/test/java/org/springframework/data/redis/cache/RedisCacheUnitTests.java
@@ -129,4 +129,16 @@ public class RedisCacheUnitTests {
 		verify(connectionMock, times(1)).eval(any(byte[].class), eq(ReturnType.INTEGER), eq(0),
 				eq((PREFIX + "*").getBytes()));
 	}
+
+	/**
+	 * @see DATAREDIS-402
+	 */
+	@Test
+	public void putShouldNotExpireKnownKeysSetWhenTtlIsZero() {
+
+		cache = new RedisCache(CACHE_NAME, NO_PREFIX_BYTES, templateSpy, 0L);
+		cache.put(KEY, VALUE);
+
+		verify(connectionMock, never()).expire(eq(KNOWN_KEYS_SET_NAME_BYTES), anyLong());
+	}
 }