diff --git a/packages/meteor/meteor.d.ts b/packages/meteor/meteor.d.ts
index 0946e586f4..f47722eb15 100644
--- a/packages/meteor/meteor.d.ts
+++ b/packages/meteor/meteor.d.ts
@@ -487,7 +487,7 @@ export namespace Meteor {
   /** True if running in development environment. */
   var isDevelopment: boolean;
   var isModern: boolean;
-  var gitCommitHash: string;
+  var gitCommitHash: string | undefined;
   var isTest: boolean;
   var isAppTest: boolean;
   var isPackageTest: boolean;