diff --git a/contrib/csup/queue.h b/contrib/csup/queue.h
index 7ae77bcf041..aa9cac165fb 100644
--- a/contrib/csup/queue.h
+++ b/contrib/csup/queue.h
@@ -35,7 +35,7 @@
 #ifndef _QUEUE_H_
 #define	_QUEUE_H_
 
-#undef __ofsetof
+#undef __offsetof
 #define	__offsetof(type, field)	((size_t)(&((type *)0)->field))
 
 /*