diff --git a/spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryITests.java b/spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryITests.java
index a12b0952..68839065 100644
--- a/spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryITests.java
+++ b/spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryITests.java
@@ -89,7 +89,7 @@ public class RedisOperationsSessionRepositoryITests extends AbstractRedisITests
 	public void saves() throws InterruptedException {
 		String username = "saves-" + System.currentTimeMillis();
 
-		String usernameSessionKey = "spring:session:RedisOperationsSessionRepositoryITests:index:"
+		String usernameSessionKey = "RedisOperationsSessionRepositoryITests:index:"
 				+ INDEX_NAME + ":" + username;
 
 		RedisSession toSave = this.repository.createSession();
@@ -188,7 +188,7 @@ public class RedisOperationsSessionRepositoryITests extends AbstractRedisITests
 
 		this.repository.save(toSave);
 
-		String body = "spring:session:RedisOperationsSessionRepositoryITests:sessions:expires:"
+		String body = "RedisOperationsSessionRepositoryITests:sessions:expires:"
 				+ toSave.getId();
 		String channel = ":expired";
 		DefaultMessage message = new DefaultMessage(channel.getBytes("UTF-8"),
@@ -356,7 +356,7 @@ public class RedisOperationsSessionRepositoryITests extends AbstractRedisITests
 
 		this.repository.save(toSave);
 
-		String body = "spring:session:RedisOperationsSessionRepositoryITests:sessions:expires:"
+		String body = "RedisOperationsSessionRepositoryITests:sessions:expires:"
 				+ toSave.getId();
 		String channel = ":expired";
 		DefaultMessage message = new DefaultMessage(channel.getBytes("UTF-8"),
diff --git a/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepository.java b/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepository.java
index a90c22dc..a33bdc7b 100644
--- a/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepository.java
+++ b/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepository.java
@@ -93,7 +93,7 @@ public class ReactiveRedisOperationsSessionRepository implements
 
 	public void setRedisKeyNamespace(String namespace) {
 		Assert.hasText(namespace, "namespace cannot be null or empty");
-		this.keyPrefix = DEFAULT_SPRING_SESSION_REDIS_PREFIX + namespace.trim() + ":";
+		this.keyPrefix = namespace.trim() + ":";
 	}
 
 	/**
diff --git a/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/RedisOperationsSessionRepository.java b/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/RedisOperationsSessionRepository.java
index f4e5e155..cc8b970e 100644
--- a/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/RedisOperationsSessionRepository.java
+++ b/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/RedisOperationsSessionRepository.java
@@ -588,7 +588,8 @@ public class RedisOperationsSessionRepository implements
 	}
 
 	public void setRedisKeyNamespace(String namespace) {
-		this.keyPrefix = DEFAULT_SPRING_SESSION_REDIS_PREFIX + namespace + ":";
+		Assert.hasText(namespace, "namespace cannot be null or empty");
+		this.keyPrefix = namespace.trim() + ":";
 	}
 
 	/**
diff --git a/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepositoryTests.java b/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepositoryTests.java
index b34692cc..1ad4e89f 100644
--- a/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepositoryTests.java
+++ b/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/ReactiveRedisOperationsSessionRepositoryTests.java
@@ -85,9 +85,7 @@ public class ReactiveRedisOperationsSessionRepositoryTests {
 	public void customRedisKeyNamespace() {
 		this.repository.setRedisKeyNamespace("test");
 
-		assertThat(ReflectionTestUtils.getField(this.repository, "keyPrefix")).isEqualTo(
-				ReactiveRedisOperationsSessionRepository.DEFAULT_SPRING_SESSION_REDIS_PREFIX
-						+ "test:");
+		assertThat(ReflectionTestUtils.getField(this.repository, "keyPrefix")).isEqualTo("test:");
 	}
 
 	@Test
diff --git a/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryTests.java b/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryTests.java
index 403a5cbe..e21c8176 100644
--- a/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryTests.java
+++ b/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryTests.java
@@ -16,6 +16,7 @@
 
 package org.springframework.session.data.redis;
 
+import java.text.MessageFormat;
 import java.time.Duration;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
@@ -709,8 +710,62 @@ public class RedisOperationsSessionRepositoryTests {
 		this.redisRepository.setRedisFlushMode(null);
 	}
 
+
+	@Test
+	public void testDefaultRedisNamespace() {
+		RedisSession session = this.redisRepository.new RedisSession(new MapSession());
+		session.setMaxInactiveInterval(Duration.ZERO);
+		given(this.redisOperations.boundHashOps(anyString()))
+				.willReturn(this.boundHashOperations);
+		given(this.redisOperations.boundSetOps(anyString()))
+				.willReturn(this.boundSetOperations);
+
+		this.redisRepository.save(session);
+
+		String id = session.getId();
+		verify(this.redisOperations, atLeastOnce())
+				.delete(getKey("expires:" + id));
+		verify(this.redisOperations, never()).boundValueOps(getKey("expires:" + id));
+	}
+
+	@Test
+	public void testRedisNamespaceChange() {
+		String namespace = "foo:bar";
+		this.redisRepository.setRedisKeyNamespace(namespace);
+		RedisSession session = this.redisRepository.new RedisSession(new MapSession());
+		session.setMaxInactiveInterval(Duration.ZERO);
+		given(this.redisOperations.boundHashOps(anyString()))
+				.willReturn(this.boundHashOperations);
+		given(this.redisOperations.boundSetOps(anyString()))
+				.willReturn(this.boundSetOperations);
+
+		this.redisRepository.save(session);
+
+		String id = session.getId();
+		verify(this.redisOperations, atLeastOnce())
+				.delete(getKeyWithinNamespace(namespace, "expires:" + id));
+		verify(this.redisOperations, never()).boundValueOps(getKeyWithinNamespace(namespace, "expires:" + id));
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testLaunchExceptionOnNullNamespace() {
+		this.redisRepository.setRedisKeyNamespace(null);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testLaunchExceptionOnEmptyNamespace() {
+		this.redisRepository.setRedisKeyNamespace("");
+	}
+
 	private String getKey(String id) {
-		return "spring:session:sessions:" + id;
+		return getKeyWithinNamespace("spring:session", id);
+	}
+
+	private String getKeyWithinNamespace(String prefix, String id) {
+		if (prefix.endsWith(":")) {
+			prefix = prefix.substring(0, prefix.length());
+		}
+		return MessageFormat.format("{0}:sessions:{1}", prefix, id);
 	}
 
 	private Map map(Object... objects) {
diff --git a/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/config/annotation/web/server/RedisWebSessionConfigurationTests.java b/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/config/annotation/web/server/RedisWebSessionConfigurationTests.java
index c4116a61..9b06ecb2 100644
--- a/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/config/annotation/web/server/RedisWebSessionConfigurationTests.java
+++ b/spring-session-data-redis/src/test/java/org/springframework/session/data/redis/config/annotation/web/server/RedisWebSessionConfigurationTests.java
@@ -82,7 +82,7 @@ public class RedisWebSessionConfigurationTests {
 				.getBean(ReactiveRedisOperationsSessionRepository.class);
 		assertThat(repository).isNotNull();
 		assertThat(ReflectionTestUtils.getField(repository, "keyPrefix"))
-				.isEqualTo("spring:session:" + REDIS_NAMESPACE + ":");
+				.isEqualTo(REDIS_NAMESPACE + ":");
 	}
 
 	@Test