diff --git a/valerie/valerie.d.ts b/valerie/valerie.d.ts
index 8e9d12988..abe5aea28 100644
--- a/valerie/valerie.d.ts
+++ b/valerie/valerie.d.ts
@@ -316,7 +316,7 @@ declare module Valerie {
         //  - either parameter can be omitted and a clone of the other parameter will be returned
         //  - the merge is shallow
         //  - array properties are shallow cloned
-        mergeOptions(defaultOptions: ValidationOptions, options): ValidationOptions;
+        mergeOptions(defaultOptions: ValidationOptions, options:any): ValidationOptions;
 
     }