diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/RedisCacheConfiguration.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/RedisCacheConfiguration.java
index 56c1bb6f6d..16fa5dd672 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/RedisCacheConfiguration.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/RedisCacheConfiguration.java
@@ -52,6 +52,7 @@ class RedisCacheConfiguration {
 	@Bean
 	public RedisCacheManager cacheManager(RedisTemplate<Object, Object> redisTemplate) {
 		RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
+		cacheManager.setUsePrefix(true);
 		List<String> cacheNames = this.cacheProperties.getCacheNames();
 		if (!cacheNames.isEmpty()) {
 			cacheManager.setCacheNames(cacheNames);
diff --git a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cache/CacheAutoConfigurationTests.java b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cache/CacheAutoConfigurationTests.java
index 2bcafc65f3..7d85a68dd0 100644
--- a/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cache/CacheAutoConfigurationTests.java
+++ b/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cache/CacheAutoConfigurationTests.java
@@ -200,6 +200,8 @@ public class CacheAutoConfigurationTests {
 		load(RedisCacheConfiguration.class, "spring.cache.type=redis");
 		RedisCacheManager cacheManager = validateCacheManager(RedisCacheManager.class);
 		assertThat(cacheManager.getCacheNames()).isEmpty();
+		assertThat((Boolean) new DirectFieldAccessor(cacheManager)
+				.getPropertyValue("usePrefix")).isTrue();
 	}
 
 	@Test
diff --git a/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc b/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc
index 4c71c0a0b4..7ed5749c00 100644
--- a/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc
+++ b/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc
@@ -3374,6 +3374,12 @@ If Redis is available and configured, the `RedisCacheManager` is auto-configured
 also possible to create additional caches on startup using the `spring.cache.cache-names`
 property.
 
+[NOTE]
+====
+By default, a key prefix is added to prevent that if two separate caches use the same
+key, Redis would have overlapping keys and be likely to return invalid values. We strongly
+recommend to keep this setting enabled if you create your own `RedisCacheManager`.
+====
 
 
 [[boot-features-caching-provider-guava]]