diff --git a/packages/type-compiler/src/compiler.ts b/packages/type-compiler/src/compiler.ts
index 64bffdaec..a88c729c5 100644
--- a/packages/type-compiler/src/compiler.ts
+++ b/packages/type-compiler/src/compiler.ts
@@ -576,14 +576,19 @@ export class ReflectionTransformer implements CustomTransformer {
             if (isMethodDeclaration(node) && node.parent && node.body && isObjectLiteralExpression(node.parent)) {
                 //replace MethodDeclaration with MethodExpression
                 // {add(v: number) {}} => {add: function (v: number) {}}
-                //so that __type can be added
-                const method = this.decorateFunctionExpression(
-                    this.f.createFunctionExpression(
-                        node.modifiers, node.asteriskToken, isIdentifier(node.name) ? node.name : undefined,
-                        node.typeParameters, node.parameters, node.type, node.body
-                    )
-                );
-                node = this.f.createPropertyAssignment(node.name, method);
+                //so that __type can be added.
+                //{default(){}} can not be converted without losing the function name, so we skip that for the moment.
+                let valid = true;
+                if (node.name.kind === SyntaxKind.Identifier && getIdentifierName(node.name) === 'default') valid = false;
+                if (valid) {
+                    const method = this.decorateFunctionExpression(
+                        this.f.createFunctionExpression(
+                            node.modifiers, node.asteriskToken, isIdentifier(node.name) ? node.name : undefined,
+                            node.typeParameters, node.parameters, node.type, node.body
+                        )
+                    );
+                    node = this.f.createPropertyAssignment(node.name, method);
+                }
             }
 
             if (isClassDeclaration(node)) {
diff --git a/packages/type-compiler/tests/transform.spec.ts b/packages/type-compiler/tests/transform.spec.ts
index c72511a70..68741fb1b 100644
--- a/packages/type-compiler/tests/transform.spec.ts
+++ b/packages/type-compiler/tests/transform.spec.ts
@@ -134,3 +134,20 @@ test('export default async function', () => {
 
     expect(res.app).toContain('export default __assignType(async function (bar: string');
 });
+
+test('default function name', () => {
+    const res = transform({
+        'app': `
+            const a = {
+                default(val: any): any {
+                    console.log('default',val)
+                    return 'default'
+                }
+            };
+        `
+    });
+
+    //`function default(` is invalid syntax.
+    //as solution we skip that transformation.
+    expect(res.app).not.toContain('function default(');
+});