diff --git a/types/mithril/test/test-api.ts b/types/mithril/test/test-api.ts
index f042baaaa6..2aebecb87e 100644
--- a/types/mithril/test/test-api.ts
+++ b/types/mithril/test/test-api.ts
@@ -116,7 +116,7 @@ const FRAME_BUDGET = 100;
 
 {
 	// define a component
-	const Greeter: m.Comp<{}, {}> = {
+	const Greeter: m.Comp<{ style: string }, {}> = {
 		view(vnode) {
 			return m("div", vnode.attrs, ["Hello ", vnode.children]);
 		}