diff --git a/src/cdk/schematics/ng-generate/drag-drop/files/__path__/__name@dasherize@if-flat__/__name@dasherize__.component.ts.template b/src/cdk/schematics/ng-generate/drag-drop/files/__path__/__name@dasherize@if-flat__/__name@dasherize__.component.ts.template
index 7e75123d2077..22aad69a0ce9 100644
--- a/src/cdk/schematics/ng-generate/drag-drop/files/__path__/__name@dasherize@if-flat__/__name@dasherize__.component.ts.template
+++ b/src/cdk/schematics/ng-generate/drag-drop/files/__path__/__name@dasherize@if-flat__/__name@dasherize__.component.ts.template
@@ -30,7 +30,7 @@ export class <%= classify(name) %>Component {
     'Walk dog'
   ];
 
-  drop(event: CdkDragDrop<string[]>) {
+  drop(event: CdkDragDrop<string[]>): void {
     if (event.previousContainer === event.container) {
       moveItemInArray(event.container.data, event.previousIndex, event.currentIndex);
     } else {