diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 4c129078f8..d07053d480 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -4477,7 +4477,7 @@ decoration {
   }
 
   messagedialog.csd & {
-    border-radius: 7px;
+    border-radius: $window_radius;
     box-shadow: 0 1px 2px transparentize(black, 0.8),
                 0 0 0 1px transparentize($_wm_border, 0.1);
   }
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index a6b5bb2267..09c76ba952 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -1886,7 +1886,7 @@ decoration:backdrop { box-shadow: 0 3px 9px 1px transparent, 0 2px 6px 2px rgba(
 
 tooltip.csd decoration { border-radius: 5px; box-shadow: none; }
 
-messagedialog.csd decoration { border-radius: 7px; box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(37, 37, 38, 0.8); }
+messagedialog.csd decoration { border-radius: 9px; box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(37, 37, 38, 0.8); }
 
 .solid-csd decoration { margin: 0; padding: 4px; background-color: #252526; border: solid 1px #252526; border-radius: 0; box-shadow: inset 0 0 0 3px #373738, inset 0 1px rgba(238, 238, 236, 0.07); }
 
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 6500bf5e6e..778f36fa16 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -1906,7 +1906,7 @@ decoration:backdrop { box-shadow: 0 3px 9px 1px transparent, 0 2px 6px 2px rgba(
 
 tooltip.csd decoration { border-radius: 5px; box-shadow: none; }
 
-messagedialog.csd decoration { border-radius: 7px; box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(0, 0, 0, 0.13); }
+messagedialog.csd decoration { border-radius: 9px; box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(0, 0, 0, 0.13); }
 
 .solid-csd decoration { margin: 0; padding: 4px; background-color: #cdc7c2; border: solid 1px #cdc7c2; border-radius: 0; box-shadow: inset 0 0 0 3px white, inset 0 1px rgba(255, 255, 255, 0.8); }