diff --git a/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js b/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
index dd2113bef8..ba190d7071 100644
--- a/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
+++ b/src/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
@@ -185,7 +185,7 @@ tinymce.PluginManager.add( 'wpeditimage', function( editor ) {
 		windowWidth = window.innerWidth;
 		toolbarWidth = toolbarNode.offsetWidth;
 		toolbarHalf = toolbarWidth / 2;
-		iframe = editor.getContentAreaContainer().firstChild;
+		iframe = document.getElementById( editor.id + '_ifr' );
 		iframePos = DOM.getPos( iframe );
 		iframeWidth = iframe.offsetWidth;
 		iframeHeigth = iframe.offsetHeight;