diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 08f5286482..f5a039e398 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3557,6 +3557,7 @@ decoration {
   .popup & { box-shadow: none; }
 
   // server-side decorations as used by mutter
+  .ssd &,
   &.ssd { box-shadow: 0 0 0 1px $_wm_border; } //just doing borders, wm draws actual shadows
 
   .csd.popup & {
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index 3ea6508155..ed61d44791 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -4557,7 +4557,7 @@ decoration {
     border-radius: 0; }
   .popup decoration {
     box-shadow: none; }
-  decoration.ssd {
+  .ssd decoration, decoration.ssd {
     box-shadow: 0 0 0 1px rgba(28, 31, 31, 0.9); }
   .csd.popup decoration {
     border-radius: 0;
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 00c31b006a..451b9e0649 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -4698,7 +4698,7 @@ decoration {
     border-radius: 0; }
   .popup decoration {
     box-shadow: none; }
-  decoration.ssd {
+  .ssd decoration, decoration.ssd {
     box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.23); }
   .csd.popup decoration {
     border-radius: 0;