Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 11534)
+++ wp-includes/formatting.php	(working copy)
@@ -2041,7 +2041,7 @@
 	$original_url = $url;
 
 	if ('' == $url) return $url;
-	$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
+	$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff\\x20]|i', '', $url);
 	$strip = array('%0d', '%0a');
 	$url = str_replace($strip, '', $url);
 	$url = str_replace(';//', '://', $url);