diff --git a/packages/skia/src/skia/types/RRect.ts b/packages/skia/src/skia/types/RRect.ts
index 16f7ba7d20..486e173306 100644
--- a/packages/skia/src/skia/types/RRect.ts
+++ b/packages/skia/src/skia/types/RRect.ts
@@ -18,6 +18,12 @@ export interface NonUniformRRect {
 export type InputRRect = SkRRect | NonUniformRRect;
 
 // We have an issue to check property existence on JSI backed instances
-export const isRRect = (def: SkRect | SkRRect): def is SkRRect =>
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  (def as any).rect !== undefined;
+export const isRRect = (def: unknown): def is SkRRect => {
+  "worklet";
+  return (
+    typeof def === "object" &&
+    def !== null &&
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    typeof (def as any).rect === "object"
+  );
+};