diff --git a/html-editor-lib.pl b/html-editor-lib.pl
index f18fde91f..6c00b0b6d 100644
--- a/html-editor-lib.pl
+++ b/html-editor-lib.pl
@@ -98,6 +98,10 @@ if ($type eq 'toolbar') {
     .ql-compose-container .ql-snow .ql-picker.ql-font .ql-picker-item::before {
         content: '$text{'editor_fontfamily_default'}';
     }
+    .ql-compose-container .ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
+    .ql-compose-container .ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
+        content: '$text{'editor_fontfamily_monospace'}';
+    }
     .ql-compose-container .ql-snow .ql-picker.ql-size .ql-picker-label[data-value="0.75em"]::before,
     .ql-compose-container .ql-snow .ql-picker.ql-size .ql-picker-item[data-value="0.75em"]::before {
         content: '$text{'editor_font_small'}';
diff --git a/mailboxes/lang/en b/mailboxes/lang/en
index a79325c83..b76b0dae9 100644
--- a/mailboxes/lang/en
+++ b/mailboxes/lang/en
@@ -454,6 +454,7 @@ left_sig=Edit Signature
 editor_heading=Heading
 editor_paragraph=Paragraph
 editor_fontfamily_default=Default
+editor_fontfamily_monospace=Fixed Width
 editor_font_small=Small
 editor_font_normal=Normal
 editor_font_medium=Medium