diff --git a/packages/react-core/src/components/Page/Page.tsx b/packages/react-core/src/components/Page/Page.tsx
index a537902efba..5ad92076dbf 100644
--- a/packages/react-core/src/components/Page/Page.tsx
+++ b/packages/react-core/src/components/Page/Page.tsx
@@ -27,7 +27,7 @@ export interface PageProps extends React.HTMLProps<HTMLDivElement> {
   /** Sets the value for role on the <main> element */
   role?: string;
   /** an id to use for the [role="main"] element */
-  mainContainerId?: string;
+  mainContainerId: string;
   /**
    * If true, manages the sidebar open/close state and there is no need to pass the isNavOpen boolean into
    * the sidebar component or add a callback onNavToggle function into the PageHeader component