diff --git a/src/plugins/expressions/common/execution/execution.test.ts b/src/plugins/expressions/common/execution/execution.test.ts
index f6ff9efca848..4776204a8ab2 100644
--- a/src/plugins/expressions/common/execution/execution.test.ts
+++ b/src/plugins/expressions/common/execution/execution.test.ts
@@ -630,6 +630,7 @@ describe('Execution', () => {
           },
         });
         expect(node2.debug?.rawError).toBeInstanceOf(Error);
+        expect(node2.debug?.rawError).toEqual(new Error('foo'));
       });
 
       test('sets .debug object to expected shape', async () => {
diff --git a/src/plugins/expressions/common/execution/execution.ts b/src/plugins/expressions/common/execution/execution.ts
index 7e7df822724a..272448870e81 100644
--- a/src/plugins/expressions/common/execution/execution.ts
+++ b/src/plugins/expressions/common/execution/execution.ts
@@ -230,8 +230,8 @@ export class Execution<
         input = output;
       } catch (rawError) {
         const timeEnd: number = this.params.debug ? performance.now() : 0;
-        rawError.message = `[${fnName}] > ${rawError.message}`;
         const error = createError(rawError) as ExpressionValueError;
+        error.error.message = `[${fnName}] > ${error.error.message}`;
 
         if (this.params.debug) {
           (link as ExpressionAstFunction).debug = {