Index: src/OFBlock.m
==================================================================
--- src/OFBlock.m
+++ src/OFBlock.m
@@ -266,13 +266,10 @@
 			if (src->forwarding == src)
 				src->forwarding = *dst;
 
 			memcpy(*dst, src, src->size);
 
-			/* src->forwarding points to us -> that's a reference */
-			(*dst)->flags++;
-
 			if (src->size >= sizeof(of_block_byref_t))
 				src->byref_keep(*dst, src);
 		} else
 			*dst = src;
 
@@ -439,11 +436,12 @@
 	return OF_RETAIN_COUNT_MAX;
 }
 
 - (void)release
 {
-	Block_release(self);
+	if (isa == (Class)&_NSConcreteMallocBlock)
+		Block_release(self);
 }
 
 - (void)dealloc
 {
 	@throw [OFNotImplementedException newWithClass: isa

Index: tests/OFBlockTests.m
==================================================================
--- tests/OFBlockTests.m
+++ tests/OFBlockTests.m
@@ -66,11 +66,11 @@
 	    [m isKindOfClass: [OFBlock class]])
 
 	TEST(@"Copying a global block", (id)g == [[g copy] autorelease])
 
 	TEST(@"Copying a malloc block",
-	    (id)m == [[m copy] autorelease] && [m retainCount] == 2)
+	    (id)m == [m copy] && [m retainCount] == 2)
 
 	TEST(@"Autorelease a stack block", R([s autorelease]))
 
 	TEST(@"Autorelease a global block", R([g autorelease]))