Index: src/OFThreadPool.m
==================================================================
--- src/OFThreadPool.m
+++ src/OFThreadPool.m
@@ -117,11 +117,11 @@
 }
 
 - (void)perform
 {
 #ifdef OF_HAVE_BLOCKS
-	if (block != nil)
+	if (block != NULL)
 		block(object);
 	else
 #endif
 		[object performSelector: selector
 			     withObject: object];