diff --git a/flow/layers/physical_shape_layer.h b/flow/layers/physical_shape_layer.h
index 4e82ac69343f2750ba469aee9cb9af92e102eeac..db6d756462acd1ccac170a2ee0077296e8c46597 100644
--- a/flow/layers/physical_shape_layer.h
+++ b/flow/layers/physical_shape_layer.h
@@ -23,6 +23,12 @@ class PhysicalShapeLayer : public ContainerLayer {
       frameRRect_ = SkRRect::MakeRect(rect);
     } else if (path.isRRect(&frameRRect_)) {
       isRect_ = frameRRect_.isRect();
+    } else {
+      // Fuchsia's compositor currently only supports rounded rectangle frames.
+      // For shapes that cannot be represented as a rounded rectangle we
+      // default to use the bounding rectangle.
+      // TODO(amirh): fix this once Fuchsia supports arbitrary shaped frames.
+      frameRRect_ = SkRRect::MakeRect(path.getBounds());
     }
   }