diff --git a/objc_darwin.h b/objc_darwin.h
index 3a09b63..d094f7a 100644
--- a/objc_darwin.h
+++ b/objc_darwin.h
@@ -26,7 +26,7 @@ struct xsize {
 	int64_t height;
 };
 
-extern struct xsize objc_msgsSend_stret_size_noargs(id obj, SEL sel);
+extern struct xsize objc_msgSend_stret_size_noargs(id obj, SEL sel);
 
 #define m1(name, type1) \
 	inline id objc_msgSend_ ## name (id obj, SEL sel, type1 a) \