Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 23328)
+++ wp-includes/functions.php	(working copy)
@@ -655,16 +655,6 @@
 	else
 		$frag = '';
 
-	if ( 0 === stripos( 'http://', $uri ) ) {
-		$protocol = 'http://';
-		$uri = substr( $uri, 7 );
-	} elseif ( 0 === stripos( 'https://', $uri ) ) {
-		$protocol = 'https://';
-		$uri = substr( $uri, 8 );
-	} else {
-		$protocol = '';
-	}
-
 	if ( strpos( $uri, '?' ) !== false ) {
 		$parts = explode( '?', $uri, 2 );
 		if ( 1 == count( $parts ) ) {
@@ -674,7 +664,7 @@
 			$base = $parts[0] . '?';
 			$query = $parts[1];
 		}
-	} elseif ( $protocol || strpos( $uri, '=' ) === false ) {
+	} elseif ( strpos( $uri, '=' ) === false ) {
 		$base = $uri . '?';
 		$query = '';
 	} else {
@@ -699,7 +689,7 @@
 	$ret = build_query( $qs );
 	$ret = trim( $ret, '?' );
 	$ret = preg_replace( '#=(&|$)#', '$1', $ret );
-	$ret = $protocol . $base . $ret . $frag;
+	$ret = $base . $ret . $frag;
 	$ret = rtrim( $ret, '?' );
 	return $ret;
 }