diff --git a/gtk/resources/theme/Adwaita/_common.scss b/gtk/resources/theme/Adwaita/_common.scss
index 4a2e4a91be..5ce7ee1334 100644
--- a/gtk/resources/theme/Adwaita/_common.scss
+++ b/gtk/resources/theme/Adwaita/_common.scss
@@ -2956,3 +2956,7 @@ GtkVolumeButton.button { padding: 8px; }
 .context-menu {
   font: initial;
 }
+
+.monospace {
+  font: Monospace;
+}
diff --git a/gtk/resources/theme/Adwaita/gtk-contained-dark.css b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
index 73d4279b0c..ea7e15ec80 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained-dark.css
@@ -4285,6 +4285,9 @@ GtkCalendar.header .menuitem.titlebutton.button:selected, .list-row:selected {
 .context-menu {
   font: initial; }
 
+.monospace {
+  font: Monospace; }
+
 /* GTK NAMED COLORS */
 @define-color theme_fg_color #eeeeec;
 @define-color theme_bg_color #393f3f;
diff --git a/gtk/resources/theme/Adwaita/gtk-contained.css b/gtk/resources/theme/Adwaita/gtk-contained.css
index e1b706cbe1..bc29815428 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained.css
@@ -4447,6 +4447,9 @@ GtkCalendar.header .menuitem.titlebutton.button:selected, .list-row:selected {
 .context-menu {
   font: initial; }
 
+.monospace {
+  font: Monospace; }
+
 /* GTK NAMED COLORS */
 @define-color theme_fg_color #2e3436;
 @define-color theme_bg_color #ededed;