diff --git a/src/runtime/component.ts b/src/runtime/component.ts
index 61a025ac3..6e4bbd923 100644
--- a/src/runtime/component.ts
+++ b/src/runtime/component.ts
@@ -23,7 +23,7 @@ export type ComponentConstructor<P extends Props = any, E = any> = (new (
 
 export class Component<Props = any, Env = any> {
   static template: string = "";
-  static props?: any;
+  static props?: Schema;
   static defaultProps?: any;
 
   props: Props;
diff --git a/src/runtime/portal.ts b/src/runtime/portal.ts
index 72d405384..5476e340c 100644
--- a/src/runtime/portal.ts
+++ b/src/runtime/portal.ts
@@ -65,7 +65,7 @@ export class Portal extends Component {
       type: String,
     },
     slots: true,
-  };
+  } as const;
 
   setup() {
     const node: any = this.__owl__;
diff --git a/src/runtime/validation.ts b/src/runtime/validation.ts
index 29063fd4b..36ed9f3ee 100644
--- a/src/runtime/validation.ts
+++ b/src/runtime/validation.ts
@@ -8,6 +8,7 @@ type BaseType =
   | typeof Date
   | typeof Object
   | typeof Array
+  | typeof Function
   | true
   | "*";
 
diff --git a/tests/components/props_validation.test.ts b/tests/components/props_validation.test.ts
index 265a36ba0..f5f744b07 100644
--- a/tests/components/props_validation.test.ts
+++ b/tests/components/props_validation.test.ts
@@ -594,7 +594,7 @@ describe("props validation", () => {
 
   test("props: can be defined with a boolean", async () => {
     class SubComp extends Component {
-      static props = { message: true };
+      static props = { message: true } as const;
     }
     expect(() => {
       validateProps(SubComp as any, {});
@@ -636,7 +636,7 @@ describe("props validation", () => {
 
   test("props: extra props cause an error, part 2", async () => {
     class SubComp extends Component {
-      static props = { message: true };
+      static props = { message: true } as const;
     }
     expect(() => {
       validateProps(SubComp as any, { message: 1, flag: true });