diff --git a/packages/element-web-module-api/element-web-module-api.api.md b/packages/element-web-module-api/element-web-module-api.api.md
index 54ae469ca0..2d341fde03 100644
--- a/packages/element-web-module-api/element-web-module-api.api.md
+++ b/packages/element-web-module-api/element-web-module-api.api.md
@@ -329,7 +329,7 @@ export interface SpacePanelItemProps {
     className?: string;
     icon?: JSX.Element;
     label: string;
-    onSelected?(): void;
+    onSelected: () => void;
     style?: React.CSSProperties;
     tooltip?: string;
 }
diff --git a/packages/element-web-module-api/src/api/extras.ts b/packages/element-web-module-api/src/api/extras.ts
index e1004ccc7b..1c8d355b26 100644
--- a/packages/element-web-module-api/src/api/extras.ts
+++ b/packages/element-web-module-api/src/api/extras.ts
@@ -40,7 +40,7 @@ export interface SpacePanelItemProps {
     /**
      * Callback when the item is selected
      */
-    onSelected?(): void;
+    onSelected: () => void;
 }
 
 /**