diff --git a/src/app/App.tsx b/src/app/App.tsx
index 62dd3065..1d91b3fa 100644
--- a/src/app/App.tsx
+++ b/src/app/App.tsx
@@ -4133,7 +4133,9 @@ export function App({ store, initialStatusMessage }: AppProps) {
                 onActivatePanel={handleActivateViewportPanel}
                 onSetPanelViewMode={handleSetViewportPanelViewMode}
                 onSetPanelDisplayMode={handleSetViewportPanelDisplayMode}
-                onToolPreviewChange={store.setViewportToolPreview}
+                onToolPreviewChange={(toolPreview) => {
+                  store.setViewportToolPreview(toolPreview);
+                }}
                 onSelectionChange={(selection) => applySelection(selection, "viewport")}
                 onCreateBoxBrush={handleCreateBoxBrush}
               />