diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index d5512cf70d..41428ce430 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -693,14 +693,8 @@ function add_query_arg() {
 	}
 
 	if ( strpos( $uri, '?' ) !== false ) {
-		$parts = explode( '?', $uri, 2 );
-		if ( 1 == count( $parts ) ) {
-			$base = '?';
-			$query = $parts[0];
-		} else {
-			$base = $parts[0] . '?';
-			$query = $parts[1];
-		}
+		list( $base, $query ) = explode( '?', $uri, 2 );
+		$base .= '?';
 	} elseif ( $protocol || strpos( $uri, '=' ) === false ) {
 		$base = $uri . '?';
 		$query = '';