diff --git a/usr/src/head/sys/param.h b/usr/src/head/sys/param.h
index 0565bc8..ea710c9 100644
--- a/usr/src/head/sys/param.h
+++ b/usr/src/head/sys/param.h
@@ -17,7 +17,7 @@
 #define PTR_NOFFSET(p, off) ((void *)(char *)(p) - (off))
 
 /* Bit related macros */
-#define BIT(n) (1 << (n))
+#define BIT(n) (1ULL << (n))
 #define ISSET(v, f)  ((v) & (f))
 
 /* Align up/down a value */