diff --git a/Userland/Libraries/LibC/stddef.h b/Userland/Libraries/LibC/stddef.h
index bd4131a7f8..49357f5c8b 100644
--- a/Userland/Libraries/LibC/stddef.h
+++ b/Userland/Libraries/LibC/stddef.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#define offsetof(type, member) __builtin_offsetof(type, member)
+
 #ifndef KERNEL
 
 #    include <sys/cdefs.h>
diff --git a/Userland/Libraries/LibC/sys/cdefs.h b/Userland/Libraries/LibC/sys/cdefs.h
index 00d6444102..e428ad6085 100644
--- a/Userland/Libraries/LibC/sys/cdefs.h
+++ b/Userland/Libraries/LibC/sys/cdefs.h
@@ -22,5 +22,3 @@
 
 #undef __P
 #define __P(a) a
-
-#define offsetof(type, member) __builtin_offsetof(type, member)