diff --git a/sys/src/cmd/urlencode.c b/sys/src/cmd/urlencode.c
index 0657312b4..b2df19712 100644
--- a/sys/src/cmd/urlencode.c
+++ b/sys/src/cmd/urlencode.c
@@ -14,7 +14,7 @@ hexdigit(int c)
 {
 	char *p;
 
-	if(c >= 0){
+	if(c > 0){
 		if((p = strchr(Hex, c)) != 0)
 			return p - Hex;
 		if((p = strchr(hex, c)) != 0)