diff --git a/wp-includes/kses.php b/wp-includes/kses.php
index 278e1de009..90e0575d01 100644
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -1397,7 +1397,7 @@ function wp_kses_html_error($string) {
  */
 function wp_kses_bad_protocol_once($string, $allowed_protocols, $count = 1 ) {
 	$string  = preg_replace( '/(&#0*58(?![;0-9])|&#x0*3a(?![;a-f0-9]))/i', '$1;', $string );
-	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;/i', $string, 2 );
+	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;|:/i', $string, 2 );
 	if ( isset($string2[1]) && ! preg_match('%/\?%', $string2[0]) ) {
 		$string = trim( $string2[1] );
 		$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );