--- /sys/src/cmd/cc/cc.h
+++ /sys/src/cmd/cc/cc.h
@@ -32,7 +32,7 @@ typedef	Rune	TRune;	/* target system type */
 #define	NTERM		10
 #define	MAXALIGN	7
 
-#define	SIGN(n)		(1ULL<<(n-1))
+#define	SIGN(n)		((uvlong)1<<(n-1))
 #define	MASK(n)		(SIGN(n)|(SIGN(n)-1))
 
 #define	BITS	5