diff --git a/Gruntfile.js b/Gruntfile.js
index b25b8dba7a..c877f9fda1 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -56,6 +56,7 @@ module.exports = function(grunt) {
 							'!wp-includes/js/backbone.js',
 							'!wp-includes/js/underscore.js',
 							'!wp-includes/js/jquery/jquery.masonry.js',
+							'!wp-includes/js/tinymce/tinymce.js',
 							'!wp-includes/version.php' // Exclude version.php
 						],
 						dest: BUILD_DIR
diff --git a/src/wp-includes/class-wp-editor.php b/src/wp-includes/class-wp-editor.php
index e4bf5a0890..572ac31182 100644
--- a/src/wp-includes/class-wp-editor.php
+++ b/src/wp-includes/class-wp-editor.php
@@ -1080,12 +1080,14 @@ final class _WP_Editors {
 		<?php
 
 		$baseurl = self::$baseurl;
+		// Load tinymce.js when running from /src, else load wp-tinymce.js.gz (production) or tinymce.min.js (SCRIPT_DEBUG)
+		$mce_suffix = false !== strpos( $GLOBALS['wp_version'], '-src' ) ? '' : '.min';
 
 		if ( $tmce_on ) {
 			if ( $compressed ) {
 				echo "<script type='text/javascript' src='{$baseurl}/wp-tinymce.php?c=1&amp;$version'></script>\n";
 			} else {
-				echo "<script type='text/javascript' src='{$baseurl}/tinymce.js?$version'></script>\n";
+				echo "<script type='text/javascript' src='{$baseurl}/tinymce{$mce_suffix}.js?$version'></script>\n";
 				echo "<script type='text/javascript' src='{$baseurl}/plugins/compat3x/plugin{$suffix}.js?$version'></script>\n";
 			}
 
diff --git a/src/wp-includes/js/tinymce/wp-tinymce.php b/src/wp-includes/js/tinymce/wp-tinymce.php
index 83a003d720..03abd2d9de 100644
--- a/src/wp-includes/js/tinymce/wp-tinymce.php
+++ b/src/wp-includes/js/tinymce/wp-tinymce.php
@@ -32,7 +32,8 @@ if ( isset($_GET['c']) && 1 == $_GET['c'] && isset($_SERVER['HTTP_ACCEPT_ENCODIN
 	header('Content-Encoding: gzip');
 	echo $file;
 } else {
-	echo get_file($basepath . '/tiny_mce.js');
-	echo get_file($basepath . '/wp-tinymce-schema.js');
+	// Back compat. This file shouldn't be used if this condition can occur (as in, if gzip isn't accepted).
+	echo get_file( $basepath . '/tinymce.min.js' );
+	echo get_file( $basepath . '/plugins/compat3x/plugin.min.js' );
 }
 exit;