diff --git a/bi.lessconfig.json b/bi.lessconfig.json
index 1a367603b..f7f3acf9b 100644
--- a/bi.lessconfig.json
+++ b/bi.lessconfig.json
@@ -18,7 +18,7 @@
   "@color-bi-background-disabled-active-checkbox-content": "#D0D4DA",
   "@color-bi-background-disabled-active-checkbox-content-theme-dark": "#606479",
   "@color-bi-background-tooltip-success": "#2E3A4D",
-  "@color-bi-text-header-background": "f2f4f7",
+  "@color-bi-text-header-background": "#f2f4f7",
   "@color-bi-border-tooltip-success": "#2E3A4D",
   "@color-bi-background-toast-success": "#FFFFFF",
   "@color-bi-background-toast-warning": "#FFFFFF",