Index: src/wp-includes/class-wp.php
===================================================================
--- src/wp-includes/class-wp.php	(revision 47527)
+++ src/wp-includes/class-wp.php	(working copy)
@@ -168,7 +168,7 @@
 			list( $pathinfo ) = explode( '?', $pathinfo );
 			$pathinfo         = str_replace( '%', '%25', $pathinfo );
 
-			list( $req_uri ) = explode( '?', $_SERVER['REQUEST_URI'] );
+			list( $req_uri ) = explode( '?', urldecode( $_SERVER['REQUEST_URI'] ) );
 			$self            = $_SERVER['PHP_SELF'];
 			$home_path       = trim( parse_url( home_url(), PHP_URL_PATH ), '/' );
 			$home_path_regex = sprintf( '|^%s|i', preg_quote( $home_path, '|' ) );