diff --git a/app/config/server.ts b/app/config/server.ts
index c455d0b7336..dffc2563e35 100644
--- a/app/config/server.ts
+++ b/app/config/server.ts
@@ -30,6 +30,9 @@ declare global {
       // google only
       GOOGLE_API_KEY?: string;
       GOOGLE_URL?: string;
+
+      // google tag manager
+      GTM_ID?: string;
     }
   }
 }