diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 89942df10d..51dfcf16d2 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -4515,11 +4515,13 @@ button.titlebutton {
 
   @include _button_text_shadow;
 
-  border-radius: 9999px;
-  padding: 6px;
-  margin: 0 2px;
-  min-width: 0;
-  min-height: 0;
+  &:not(.appmenu) {
+    border-radius: 9999px;
+    padding: 6px;
+    margin: 0 2px;
+    min-width: 0;
+    min-height: 0;
+  }
 
   .selection-mode & {
     @extend %button.flat.suggested-action;
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 7f7583b7fb..984b2fa4a8 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -1956,7 +1956,9 @@ messagedialog.csd decoration { border-radius: 8px; box-shadow: 0 1px 2px rgba(0,
 
 .solid-csd decoration:backdrop { box-shadow: inset 0 0 0 3px #353535, inset 0 1px rgba(238, 238, 236, 0.07); }
 
-button.titlebutton { text-shadow: 0 -1px rgba(0, 0, 0, 0.834353); -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.834353); border-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
+button.titlebutton { text-shadow: 0 -1px rgba(0, 0, 0, 0.834353); -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.834353); }
+
+button.titlebutton:not(.appmenu) { border-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
 
 button.titlebutton:backdrop { -gtk-icon-shadow: none; }
 
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 85185dd796..5dd77a0378 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -1972,7 +1972,9 @@ messagedialog.csd decoration { border-radius: 8px; box-shadow: 0 1px 2px rgba(0,
 
 .solid-csd decoration:backdrop { box-shadow: inset 0 0 0 3px #f6f5f4, inset 0 1px rgba(255, 255, 255, 0.8); }
 
-button.titlebutton { text-shadow: 0 1px rgba(255, 255, 255, 0.769231); -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.769231); border-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
+button.titlebutton { text-shadow: 0 1px rgba(255, 255, 255, 0.769231); -gtk-icon-shadow: 0 1px rgba(255, 255, 255, 0.769231); }
+
+button.titlebutton:not(.appmenu) { border-radius: 9999px; padding: 6px; margin: 0 2px; min-width: 0; min-height: 0; }
 
 button.titlebutton:backdrop { -gtk-icon-shadow: none; }