diff --git src/wp-includes/script-loader.php src/wp-includes/script-loader.php
index b21f9a6f49..6775c7a746 100644
--- src/wp-includes/script-loader.php
+++ src/wp-includes/script-loader.php
@@ -108,10 +108,10 @@ function wp_default_packages_vendor( &$scripts ) {
 			$dependencies = array();
 		}
 
-		$path = "/wp-includes/js/dist/vendor/$handle$dev_suffix.js";
+		$src = $scripts->base_url . "/wp-includes/js/dist/vendor/$handle$dev_suffix.js";
 		$version = $vendor_scripts_versions[ $handle ];
 
-		$scripts->add( $handle, $path, $dependencies, $version, 1 );
+		$scripts->add( $handle, $src, $dependencies, $version, 1 );
 	}
 
 	$scripts->add( 'wp-polyfill', null, array( 'wp-polyfill' ) );