diff --git a/sys/src/cmd/mothra/mothra.c b/sys/src/cmd/mothra/mothra.c
index 92f4f0ef4..dc2ef56ce 100644
--- a/sys/src/cmd/mothra/mothra.c
+++ b/sys/src/cmd/mothra/mothra.c
@@ -3,7 +3,6 @@
  */
 #include <u.h>
 #include <libc.h>
-#include <ctype.h>
 #include <draw.h>
 #include <event.h>
 #include <keyboard.h>
@@ -542,7 +541,7 @@ void docmd(Panel *p, char *s){
 		break;
 	case 'j':
 		s=arg(s);
-		if(isdigit(s))
+		if(*s)
 			geturl(www(atoi(s)-1)->url->fullname, GET, 0, 0, 0);
 		else
 			message("no url selected");