diff --git a/src/rpc-worker-loader.js b/src/rpc-worker-loader.js
index ca9b766..6e8dd4d 100644
--- a/src/rpc-worker-loader.js
+++ b/src/rpc-worker-loader.js
@@ -16,6 +16,9 @@ function workerSetup() {
 				.catch(e => {
 					let error = { message: e };
 					if (e.stack) {
+						error = Object.assign({}, e);
+
+						/* Include potentially nonenumerable values */
 						error.message = e.message;
 						error.stack = e.stack;
 						error.name = e.name;
diff --git a/test/src/index.test.js b/test/src/index.test.js
index 0b1bfc8..43f4951 100644
--- a/test/src/index.test.js
+++ b/test/src/index.test.js
@@ -26,6 +26,7 @@ describe('worker', () => {
 		}
 		catch (e) {
 			expect(e).toEqual(Error('Error in worker.js'));
+			expect(e.foo).toEqual('bar');
 		}
 	});
 
diff --git a/test/src/worker.js b/test/src/worker.js
index 73b1049..9b1f960 100644
--- a/test/src/worker.js
+++ b/test/src/worker.js
@@ -7,7 +7,9 @@ export function foo() {
 }
 
 export function throwError() {
-	throw new Error('Error in worker.js');
+	const toThrow = new Error('Error in worker.js');
+	toThrow.foo = 'bar';
+	throw toThrow;
 }
 
 export const bar = (a, b) => `${a} [bar:${otherBar}] ${b}`;