diff --git a/app/destinations/destination_edit.php b/app/destinations/destination_edit.php
index f3d7f0e5ce..1e44014a10 100644
--- a/app/destinations/destination_edit.php
+++ b/app/destinations/destination_edit.php
@@ -156,10 +156,15 @@
 				exit;
 			}
 
+		//prevent spaces from being considered as a valid destination_number
+			if (isset($destination_number)) {
+				$destination_number = trim($destination_number);
+			}
+
 		//check for all required data
 			$msg = '';
 			if (strlen($destination_type) == 0) { $msg .= $text['message-required']." ".$text['label-destination_type']."<br>\n"; }
-			//if (strlen($destination_number) == 0) { $msg .= $text['message-required']." ".$text['label-destination_number']."<br>\n"; }
+			if (strlen($destination_number) == 0) { $msg .= $text['message-required']." ".$text['label-destination_number']."<br>\n"; }
 			if (strlen($destination_context) == 0) { $msg .= $text['message-required']." ".$text['label-destination_context']."<br>\n"; }
 			if (strlen($destination_enabled) == 0) { $msg .= $text['message-required']." ".$text['label-destination_enabled']."<br>\n"; }