diff --git a/types/index.d.ts b/types/index.d.ts
index aeb69617f..69ee03a9a 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -24,14 +24,11 @@ export declare class Store<S> {
   subscribeAction<P extends ActionPayload>(fn: SubscribeActionOptions<P, S>, options?: SubscribeOptions): () => void;
   watch<T>(getter: (state: S, getters: any) => T, cb: (value: T, oldValue: T) => void, options?: WatchOptions): () => void;
 
-  registerModule<T>(path: string, module: Module<T, S>, options?: ModuleOptions): void;
-  registerModule<T>(path: string[], module: Module<T, S>, options?: ModuleOptions): void;
+  registerModule<T>(path: string | string[], module: Module<T, S>, options?: ModuleOptions): void;
 
-  unregisterModule(path: string): void;
-  unregisterModule(path: string[]): void;
+  unregisterModule(path: string | string[]): void;
 
-  hasModule(path: string): boolean;
-  hasModule(path: string[]): boolean;
+  hasModule(path: string | string[]): boolean;
 
   hotUpdate(options: {
     actions?: ActionTree<S, S>;
diff --git a/types/test/index.ts b/types/test/index.ts
index 32d5ec2c6..a03bdff11 100644
--- a/types/test/index.ts
+++ b/types/test/index.ts
@@ -342,6 +342,10 @@ namespace RegisterModule {
     };
   }
 
+  function getInsideModulePath(): string | string[] {
+    return Math.random() > 0.5 ? ["c"] : "c"
+  }
+
   const store = new Vuex.Store<RootState>({
     state: {
       value: 0
@@ -364,6 +368,12 @@ namespace RegisterModule {
 
   store.hasModule(['a', 'b'])
 
+  store.registerModule(getInsideModulePath(), {
+    state: {value: 3}
+  })
+
+  store.hasModule(getInsideModulePath())
+
   store.unregisterModule(["a", "b"]);
   store.unregisterModule("a");
 }