diff --git a/global.go b/global.go
index 0c1782f..28f233f 100644
--- a/global.go
+++ b/global.go
@@ -722,6 +722,8 @@ func newContext() *_runtime {
 	self._newError["URIError"] = self.defineError("URIError")
 
 	self.eval = self.GlobalObject.get("eval")._object()
+	// eval.prototype === undefined
+	self.eval.stash.delete("prototype")
 	self.GlobalObject.prototype = self.Global.ObjectPrototype
 
 	return self
diff --git a/global_test.go b/global_test.go
index a6dfcb7..735397d 100644
--- a/global_test.go
+++ b/global_test.go
@@ -45,6 +45,7 @@ func TestGlobal(t *testing.T) {
 	test(`this.hasOwnProperty`, "[function]")
 
 	test(`eval.length === 1`, "true")
+	test(`eval.prototype === undefined`, "true")
 }
 
 func TestGlobalLength(t *testing.T) {