diff --git a/src/wp-includes/class-wp-editor.php b/src/wp-includes/class-wp-editor.php
index 200031bbdc..95b533e7b2 100644
--- a/src/wp-includes/class-wp-editor.php
+++ b/src/wp-includes/class-wp-editor.php
@@ -600,6 +600,8 @@ final class _WP_Editors {
 				}
 			}
 
+			$body_class .= ' locale-' . sanitize_html_class( strtolower( str_replace( '_', '-', get_locale() ) ) );
+
 			if ( !empty($set['tinymce']['body_class']) ) {
 				$body_class .= ' ' . $set['tinymce']['body_class'];
 				unset($set['tinymce']['body_class']);
diff --git a/src/wp-includes/css/editor.css b/src/wp-includes/css/editor.css
index b05def96fe..e69869a403 100644
--- a/src/wp-includes/css/editor.css
+++ b/src/wp-includes/css/editor.css
@@ -807,6 +807,14 @@ i.mce-i-hr:before {
 	box-sizing: border-box;
 }
 
+.rtl .wp-editor-area {
+	font-family: Tahoma, Monaco, monospace;
+}
+
+.locale-he-il .wp-editor-area {
+	font-family: Arial, Monaco, monospace;
+}
+
 .wp-editor-container textarea.wp-editor-area {
 	width: 100%;
 	margin: 0;
diff --git a/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css b/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
index 9cd5c944b8..d3e17d4dcb 100644
--- a/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
+++ b/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
@@ -17,6 +17,14 @@ body {
 	margin: 9px 10px;
 }
 
+body.rtl {
+	font-family: Tahoma, "Times New Roman", "Bitstream Charter", Times, serif;
+}
+
+body.locale-he-il {
+	font-family: Arial, "Times New Roman", "Bitstream Charter", Times, serif;
+}
+
 body.wp-autoresize {
 	max-width: 100%;
 	overflow: visible !important;