diff --git a/packages/sandbox/src/sandbox.js b/packages/sandbox/src/sandbox.js
index a162321..0b6c452 100644
--- a/packages/sandbox/src/sandbox.js
+++ b/packages/sandbox/src/sandbox.js
@@ -372,7 +372,21 @@ export default class Sandbox {
     for (let i = 0; i < properties.length; i++) {
       if (types.isObjectProperty(properties[i])) {
         const {computed, key, value} = properties[i];
-        const k = computed ? this.evaluate(key) : {value: key.name};
+        let k;
+        if (computed) {
+          k = this.evaluate(key);
+        }
+        else if (types.isIdentifier(key)) {
+          k = {value: key.name};
+        }
+        else if (types.isStringLiteral(key)) {
+          k = {value: key.value};
+        }
+        else {
+          // eslint-disable-next-line no-console
+          console.error("evaluateObjectExpression(): Can't handle key type", key.type);
+          k = {value: undefined};
+        }
         const v = this.evaluate(value);
         // eslint-disable-next-line no-bitwise
         isAsync |= k.async | v.async;
diff --git a/packages/sandbox/test/object-expression.js b/packages/sandbox/test/object-expression.js
index 0e4e212..8f4533a 100644
--- a/packages/sandbox/test/object-expression.js
+++ b/packages/sandbox/test/object-expression.js
@@ -18,6 +18,8 @@ it('evaluates async ObjectExpression', async () => {
 it('evaluates ObjectExpression', () => {
   expect(new Sandbox(parse('({a: 1, b: 2})')).next().value)
     .to.deep.include({value: {a: 1, b: 2}});
+  expect(new Sandbox(parse('({"a": 1, "b": 2})')).next().value)
+    .to.deep.include({value: {a: 1, b: 2}});
 });
 
 it('evaluates async SpreadElement', async () => {