diff --git a/os/utils.c b/os/utils.c
index 7461ef9f87..61a3feca56 100644
--- a/os/utils.c
+++ b/os/utils.c
@@ -336,7 +336,7 @@ UseMsg(void)
 static int
 VerifyDisplayName(const char *d)
 {
-    int i;
+    unsigned int i;
     int period_found = FALSE;
     int after_period = 0;