diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 86ddbddbd19..5337b2475cd 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -783,9 +783,10 @@ HRESULT forin_statement_eval(exec_ctx_t *ctx, statement_t *_stat, return_type_t
         return hres;
 
     if(V_VT(&val) != VT_DISPATCH) {
-        FIXME("in vt %d\n", V_VT(&val));
+        TRACE("in vt %d\n", V_VT(&val));
         VariantClear(&val);
-        return E_NOTIMPL;
+        V_VT(ret) = VT_EMPTY;
+        return S_OK;
     }
 
     hres = IDispatch_QueryInterface(V_DISPATCH(&val), &IID_IDispatchEx, (void**)&in_obj);
diff --git a/dlls/jscript/tests/lang.js b/dlls/jscript/tests/lang.js
index 5f13b05d85b..2a6e04a2794 100644
--- a/dlls/jscript/tests/lang.js
+++ b/dlls/jscript/tests/lang.js
@@ -142,6 +142,15 @@ ok(obj2.pvar === 3, "obj2.pvar is not 3");
 var obj3 = new Object;
 ok(typeof(obj3) === "object", "typeof(obj3) is not object");
 
+for(var iter in "test")
+    ok(false, "unexpected forin call, test = " + iter);
+
+for(var iter in null)
+    ok(false, "unexpected forin call, test = " + iter);
+
+for(var iter in false)
+    ok(false, "unexpected forin call, test = " + iter);
+
 tmp = 0;
 if(true)
     tmp = 1;