diff --git a/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js b/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
index 25d3356265..7f13d84357 100644
--- a/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
+++ b/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
@@ -382,13 +382,15 @@ tinymce.PluginManager.add( 'wpeditimage', function( editor ) {
 			src: imageData.url,
 			width: width || null,
 			height: height || null,
-			alt: imageData.alt,
 			title: imageData.title || null,
 			'class': classes.join( ' ' ) || null
 		};
 
 		dom.setAttribs( imageNode, attrs );
 
+		// Preserve empty alt attributes.
+		editor.$( imageNode ).attr( 'alt', imageData.alt || '' );
+
 		linkAttrs = {
 			href: imageData.linkUrl,
 			rel: imageData.linkRel || null,
@@ -1026,7 +1028,7 @@ tinymce.PluginManager.add( 'wpeditimage', function( editor ) {
 	editor.on( 'beforeGetContent', function( event ) {
 		if ( event.format !== 'raw' ) {
 			editor.$( 'img[id="__wp-temp-img-id"]' ).attr( 'id', null );
-		}	
+		}
 	});
 
 	editor.on( 'BeforeSetContent', function( event ) {