diff --git a/types/component.d.ts b/types/component.d.ts
index e582b6e21..61bf6bc06 100644
--- a/types/component.d.ts
+++ b/types/component.d.ts
@@ -3,7 +3,7 @@ import Vue from 'vue'
 /** ElementUI component common definition */
 export declare class ElementUIComponent extends Vue {
   /** Install component into Vue */
-  static install (vue: typeof Vue)
+  static install (vue: typeof Vue): void
 }
 
 /** Component size definition for button, input, etc */
diff --git a/types/index.d.ts b/types/index.d.ts
index 32affc60b..6f1c51ab7 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -77,7 +77,7 @@ declare namespace ElementUI {
    * Please do not invoke this method directly.
    * Call `Vue.use(ElementUI)` to install.
    */
-  export function install (vue: typeof Vue, options: ElementUI.InstallationOptions)
+  export function install (vue: typeof Vue, options: ElementUI.InstallationOptions): void
 
   /** ElementUI component common definition */
   export type Component = ElementUIComponent