@@ -198,15 +198,19 @@
 #ifdef OF_HAVE_BLOCKS
 - (void)replaceObjectsUsingBlock: (of_dictionary_replace_block_t)block
 {
 	[self enumerateKeysAndObjectsUsingBlock: ^ (id key, id object,
 	    bool *stop) {
-		[self setObject: block(key, object, stop)
-			 forKey: key];
+		id new = block(key, object);
+
+		if (new != object) {
+			[self setObject: block(key, object)
+				 forKey: key];
+		}
 	}];
 }
 #endif
 
 - (void)makeImmutable
 {
 }
 @end