diff --git a/libs/c/include/stddef.h b/libs/c/include/stddef.h
index b0c76af3..4858fe46 100644
--- a/libs/c/include/stddef.h
+++ b/libs/c/include/stddef.h
@@ -5,6 +5,6 @@
 
 typedef unsigned int size_t;
 
-#define offsetof(type, member) (size_t) &((type *) NULL)->member
+#define offsetof(type, member) ((size_t) &((type *) NULL)->member)
 
 #endif