diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 1fbe282434..c8ed44924c 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3800,6 +3800,8 @@ colorswatch {
   }
 }
 
+// colorscale popup
+colorchooser .popover.osd { border-radius: 5px; }
 
 /********
  * Misc *
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index a4a9911daf..92b261dafe 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -4077,6 +4077,9 @@ colorswatch#editor-color-sample {
   colorswatch#editor-color-sample overlay {
     border-radius: 4.5px; }
 
+colorchooser .popover.osd {
+  border-radius: 5px; }
+
 /********
  * Misc *
  ********/
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index 8cce22303c..f981dbde8b 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -4110,6 +4110,9 @@ colorswatch#editor-color-sample {
   colorswatch#editor-color-sample overlay {
     border-radius: 4.5px; }
 
+colorchooser .popover.osd {
+  border-radius: 5px; }
+
 /********
  * Misc *
  ********/