diff --git a/main/link/linkfunctions.php b/main/link/linkfunctions.php
index 750317062c..91d2635018 100755
--- a/main/link/linkfunctions.php
+++ b/main/link/linkfunctions.php
@@ -53,7 +53,7 @@ function addlinkcategory($type) {
 		$description = trim($description);
 
 		// If title is empty, an error occurs
-		if (empty($urllink) || $urllink == 'http://') {
+		if (filter_var($urllink, FILTER_VALIDATE_URL) == false) {
 			$msgErr = get_lang('GiveURL');
 			Display::display_error_message(get_lang('GiveURL'));
 			$ok = false;