diff --git a/gitweb.cgi b/gitweb.cgi
index fb0ff761aa..1e19c3117f 100755
--- a/gitweb.cgi
+++ b/gitweb.cgi
@@ -146,7 +146,7 @@ sub validate_input {
 	if ($input =~ m/(^|\/)(|\.|\.\.)($|\/)/) {
 		return undef;
 	}
-	if ($input =~ m/[^a-zA-Z0-9_\x80-\xff\ \.\/\-\+\#\~\%]/) {
+	if ($input =~ m/[^a-zA-Z0-9_\x80-\xff\ \t\.\/\-\+\#\~\%]/) {
 		return undef;
 	}
 	return $input;