diff --git a/src/gmutil.c b/src/gmutil.c

index 2b40367d..857cd990 100644

--- a/src/gmutil.c

+++ b/src/gmutil.c

@@ -312,7 +312,7 @@ iBool isLikelyUrl_String(const iString *d) {

    hostname */

 iRegExp *pattern = new_RegExp("^([a-z]+:)?//.*|"

                               "^(//)?([^/?#: ]+)([/?#:].*)$|"

- "^(\w+(\.\w+)+|localhost)$",

+ "^([-\w]+(\.[-\w]+)+|localhost)$",

                               caseInsensitive_RegExpOption);

 iRegExpMatch m;

 init_RegExpMatch(&m);