diff --git a/types/dirty-chai/index.d.ts b/types/dirty-chai/index.d.ts
index f350ad5c99..4b8aa2839f 100644
--- a/types/dirty-chai/index.d.ts
+++ b/types/dirty-chai/index.d.ts
@@ -19,8 +19,8 @@ declare global {
         }
 
         interface PromisedAssertion extends Eventually, PromiseLike<any> {
-            (message?: string): Assertion;
-            ensure: Assertion;
+            (message?: string): PromisedAssertion;
+            ensure: PromisedAssertion;
         }
     }
 }