diff --git a/src/Mod/Start/Gui/ThemeSelectorWidget.cpp b/src/Mod/Start/Gui/ThemeSelectorWidget.cpp
index 44d3bb843a..424ab30c89 100644
--- a/src/Mod/Start/Gui/ThemeSelectorWidget.cpp
+++ b/src/Mod/Start/Gui/ThemeSelectorWidget.cpp
@@ -141,6 +141,16 @@ void ThemeSelectorWidget::themeChanged(Theme newTheme)
             prefPackManager->apply("FreeCAD Light");
             break;
     }
+    ParameterGrp::handle hGrp =
+        App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Themes");
+    const unsigned long nonExistentColor = -1434171135;
+    const unsigned long defaultAccentColor = 1434171135;
+    unsigned long longAccentColor1 = hGrp->GetUnsigned("ThemeAccentColor1", nonExistentColor);
+    if (longAccentColor1 == nonExistentColor) {
+        hGrp->SetUnsigned("ThemeAccentColor1", defaultAccentColor);
+        hGrp->SetUnsigned("ThemeAccentColor2", defaultAccentColor);
+        hGrp->SetUnsigned("ThemeAccentColor3", defaultAccentColor);
+    }
 }
 
 bool ThemeSelectorWidget::eventFilter(QObject* object, QEvent* event)