diff --git a/include/asm-x86/system_64.h b/include/asm-x86/system_64.h
index 14ad6138439b..560470ea27c8 100644
--- a/include/asm-x86/system_64.h
+++ b/include/asm-x86/system_64.h
@@ -73,8 +73,6 @@
 #define read_barrier_depends()	do {} while(0)
 #define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
 
-#define warn_if_not_ulong(x) do { unsigned long foo; (void) (&(x) == &foo); } while (0)
-
 static inline unsigned long read_cr8(void)
 {
 	unsigned long cr8;