diff --git a/src/tool_urlglob.c b/src/tool_urlglob.c
index 23fc7f39e..e68e30e84 100644
--- a/src/tool_urlglob.c
+++ b/src/tool_urlglob.c
@@ -201,7 +201,7 @@ static CURLcode glob_range(URLGlob *glob, char **patternp,
         unsigned long lstep;
         errno = 0;
         lstep = strtoul(&pattern[4], &endp, 10);
-        if(errno || (*endp != ']'))
+        if(errno || &pattern[4] == endp || *endp != ']')
           step = -1;
         else {
           pattern = endp+1;