diff --git a/nsock/src/gh_heap.h b/nsock/src/gh_heap.h
index 82407aabf..654774a3e 100644
--- a/nsock/src/gh_heap.h
+++ b/nsock/src/gh_heap.h
@@ -73,7 +73,7 @@
 
 #if !defined(container_of)
 #define container_of(ptr, type, member) \
-        ((type *)((char *)(ptr)-(char *)(&((type *)0)->member)))
+        ((type *)((char *)(ptr) - offsetof(type, member)))
 #endif