diff --git a/src/viewport-three/ViewportCanvas.tsx b/src/viewport-three/ViewportCanvas.tsx
index 01d8ddd6..cd8bc137 100644
--- a/src/viewport-three/ViewportCanvas.tsx
+++ b/src/viewport-three/ViewportCanvas.tsx
@@ -37,7 +37,7 @@ interface ViewportCanvasProps {
   focusRequestId: number;
   focusSelection: EditorSelection;
   onSelectionChange(selection: EditorSelection): void;
-  onCommitCreation(toolPreview: CreationViewportToolPreview): void;
+  onCommitCreation(toolPreview: CreationViewportToolPreview): boolean;
   onToolPreviewChange(toolPreview: ViewportToolPreview): void;
 }