diff --git a/org.springframework.context/src/main/java/org/springframework/cache/support/AbstractCacheManager.java b/org.springframework.context/src/main/java/org/springframework/cache/support/AbstractCacheManager.java
index e24fd746c0..95dfa7cc7a 100644
--- a/org.springframework.context/src/main/java/org/springframework/cache/support/AbstractCacheManager.java
+++ b/org.springframework.context/src/main/java/org/springframework/cache/support/AbstractCacheManager.java
@@ -44,7 +44,7 @@ public abstract class AbstractCacheManager implements CacheManager, Initializing
 
 
 	public void afterPropertiesSet() {
-		Collection<Cache> caches = loadCaches();
+		Collection<? extends Cache> caches = loadCaches();
 		Assert.notEmpty(caches, "loadCaches must not return an empty Collection");
 		this.cacheMap.clear();
 
@@ -73,6 +73,6 @@ public abstract class AbstractCacheManager implements CacheManager, Initializing
 	 * Load the caches for this cache manager. Occurs at startup.
 	 * The returned collection must not be null.
 	 */
-	protected abstract Collection<Cache> loadCaches();
+	protected abstract Collection<? extends Cache> loadCaches();
 
 }
diff --git a/org.springframework.context/src/main/java/org/springframework/cache/support/SimpleCacheManager.java b/org.springframework.context/src/main/java/org/springframework/cache/support/SimpleCacheManager.java
index 3350309cd8..007ba989cd 100644
--- a/org.springframework.context/src/main/java/org/springframework/cache/support/SimpleCacheManager.java
+++ b/org.springframework.context/src/main/java/org/springframework/cache/support/SimpleCacheManager.java
@@ -29,17 +29,17 @@ import org.springframework.cache.Cache;
  */
 public class SimpleCacheManager extends AbstractCacheManager {
 
-	private Collection<Cache> caches;
+	private Collection<? extends Cache> caches;
 
 	/**
 	 * Specify the collection of Cache instances to use for this CacheManager.
 	 */
-	public void setCaches(Collection<Cache> caches) {
+	public void setCaches(Collection<? extends Cache> caches) {
 		this.caches = caches;
 	}
 
 	@Override
-	protected Collection<Cache> loadCaches() {
+	protected Collection<? extends Cache> loadCaches() {
 		return this.caches;
 	}