diff --git a/doubleclick-gpt/index.d.ts b/doubleclick-gpt/index.d.ts
index 04a1e8b50b..804dc5e924 100644
--- a/doubleclick-gpt/index.d.ts
+++ b/doubleclick-gpt/index.d.ts
@@ -170,4 +170,4 @@ declare namespace googletag {
     }
 }
 
-declare const googletag: googletag.Googletag;
+declare let googletag: googletag.Googletag;