diff --git a/core/modules/color/color.module b/core/modules/color/color.module
index dc8be4a..39730bf 100644
--- a/core/modules/color/color.module
+++ b/core/modules/color/color.module
@@ -132,7 +132,7 @@ function color_get_palette($theme, $default = FALSE) {
 
   // Load variable.
   // @todo Default color config should be moved to yaml in the theme.
-  return config('color.' . $theme)->get('palette') ?: $palette;
+  return config('color.' . $theme)->get('palette') + $palette;
 }
 
 /**