diff --git a/types/sequencify/index.d.ts b/types/sequencify/index.d.ts
index bd514b70ec..2755df8bce 100644
--- a/types/sequencify/index.d.ts
+++ b/types/sequencify/index.d.ts
@@ -19,4 +19,4 @@ declare namespace sequencify {
     }
 }
 
-declare function sequencify(tasks: sequencify.TaskMap, names: Array<keyof sequencify.TaskMap>, results: string[], nest?: string[]): void;
+declare function sequencify<T extends sequencify.TaskMap>(tasks: T, names: Array<keyof T>, results: Array<keyof T>, nest?: string[]): void;