diff --git a/packages/grafana-ui/src/themes/dark.ts b/packages/grafana-ui/src/themes/dark.ts
index eca7c5b7488..8f7727416f3 100644
--- a/packages/grafana-ui/src/themes/dark.ts
+++ b/packages/grafana-ui/src/themes/dark.ts
@@ -36,7 +36,7 @@ const basicColors = {
   purple: '#9933cc',
   variable: '#32d1df',
   orange: '#eb7b18',
-  orangeDark: '#ff780A',
+  orangeDark: '#ff780a',
 };
 
 const darkTheme: GrafanaTheme = {