diff --git a/libs/c/include/stddef.h b/libs/c/include/stddef.h
index 4986043a..b0c76af3 100644
--- a/libs/c/include/stddef.h
+++ b/libs/c/include/stddef.h
@@ -5,4 +5,6 @@
 
 typedef unsigned int size_t;
 
+#define offsetof(type, member) (size_t) &((type *) NULL)->member
+
 #endif