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-rw-r--r--misc/sys/select.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/misc/sys/select.h b/misc/sys/select.h
index fd13bab41a..941588d9c4 100644
--- a/misc/sys/select.h
+++ b/misc/sys/select.h
@@ -58,7 +58,7 @@ typedef long int __fd_mask;
 /* It's easier to assume 8-bit bytes than to get CHAR_BIT.  */
 #define __NFDBITS	(8 * (int) sizeof (__fd_mask))
 #define	__FD_ELT(d)	((d) / __NFDBITS)
-#define	__FD_MASK(d)	((__fd_mask) 1 << ((d) % __NFDBITS))
+#define	__FD_MASK(d)	((__fd_mask) (1UL << ((d) % __NFDBITS)))
 
 /* fd_set for select and pselect.  */
 typedef struct