diff --git a/src/deployer.ts b/src/deployer.ts
index 3d18aed12..b99c6c7cc 100644
--- a/src/deployer.ts
+++ b/src/deployer.ts
@@ -105,6 +105,6 @@ export namespace Deployer {
    * ```
    */
   export type Options<T = AnyJson> = JsonMap & {
-    [key: string]: T;
+    [key: string]: T | undefined;
   };
 }