diff --git a/__tests__/test-utils/gas-stubs.ts b/__tests__/test-utils/gas-stubs.ts
index c8ee51d5..391e49a2 100644
--- a/__tests__/test-utils/gas-stubs.ts
+++ b/__tests__/test-utils/gas-stubs.ts
@@ -40,7 +40,7 @@ export function mockedCommentsCollection(): GoogleAppsScript.Drive.Collection.Co
   };
 }
 
-export function mockedDrive(): GoogleAppsScript.Drive {
+export function mockedDrive(): GoogleAppsScript.Drive_v2 {
   return {
     newChannel: jest.fn<() => GoogleAppsScript.Drive.Schema.Channel>(),
     newChildReference:
diff --git a/backend.tsconfig.json b/backend.tsconfig.json
index 8ef0f23c..d6ea6779 100644
--- a/backend.tsconfig.json
+++ b/backend.tsconfig.json
@@ -5,5 +5,8 @@
     "lib": ["es6"],
     "types": ["google-apps-script"],
     "verbatimModuleSyntax": false
-  }
+  },
+  "include": [
+    "src/backend/Drive-shim.d.ts"
+  ]
 }
diff --git a/src/backend/Drive-shim.d.ts b/src/backend/Drive-shim.d.ts
new file mode 100644
index 00000000..ce82bbb9
--- /dev/null
+++ b/src/backend/Drive-shim.d.ts
@@ -0,0 +1,7 @@
+// eslint-disable-next-line @typescript-eslint/naming-convention -- GAS global
+declare var Drive: GoogleAppsScript.Drive_v2;
+
+declare global {
+  // eslint-disable-next-line @typescript-eslint/naming-convention -- GAS global
+  var Drive: GoogleAppsScript.Drive_v2;
+}