diff --git a/syscall.c b/syscall.c
index ef14a0a..120b19b 100644
--- a/syscall.c
+++ b/syscall.c
@@ -423,7 +423,7 @@
 
 	if (*s >= '0' && *s <= '9') {
 		i = string_to_uint(s);
-		if (i > MAX_NSYSCALLS)
+		if (i >= MAX_NSYSCALLS)
 			return -1;
 		qualify_one(i, bitflag, not, -1);
 		return 0;