diff --git a/dlls/oleaut32/tests/tmarshal.c b/dlls/oleaut32/tests/tmarshal.c
index c9ea77d4b85..ba28892820a 100644
--- a/dlls/oleaut32/tests/tmarshal.c
+++ b/dlls/oleaut32/tests/tmarshal.c
@@ -587,6 +587,13 @@ static HRESULT WINAPI Widget_get_prop_uint(
     return S_OK;
 }
 
+static HRESULT WINAPI Widget_ByRefUInt(
+    IWidget* iface, UINT *i)
+{
+    *i = 42;
+    return S_OK;
+}
+
 static const struct IWidgetVtbl Widget_VTable =
 {
     Widget_QueryInterface,
@@ -618,7 +625,8 @@ static const struct IWidgetVtbl Widget_VTable =
     Widget_put_prop_with_lcid,
     Widget_get_prop_with_lcid,
     Widget_get_prop_int,
-    Widget_get_prop_uint
+    Widget_get_prop_uint,
+    Widget_ByRefUInt,
 };
 
 static HRESULT WINAPI StaticWidget_QueryInterface(IStaticWidget *iface, REFIID riid, void **ppvObject)
@@ -935,6 +943,7 @@ static void test_typelibmarshal(void)
     ITypeInfo *pTypeInfo;
     MYSTRUCT mystruct;
     MYSTRUCT mystructArray[5];
+    UINT uval;
 
     ok(pKEW != NULL, "Widget creation failed\n");
 
@@ -1342,6 +1351,25 @@ static void test_typelibmarshal(void)
     ok(V_UI4(&varresult) == 42, "got %x\n", V_UI4(&varresult));
     VariantClear(&varresult);
 
+    /* test byref marshalling */
+    uval = 666;
+    VariantInit(&vararg[0]);
+    V_VT(&vararg[0]) = VT_UI4|VT_BYREF;
+    V_UI4REF(&vararg[0]) = &uval;
+    dispparams.cNamedArgs = 0;
+    dispparams.cArgs = 1;
+    dispparams.rgvarg = vararg;
+    dispparams.rgdispidNamedArgs = NULL;
+    hr = IDispatch_Invoke(pDispatch, DISPID_TM_BYREF_UINT, &IID_NULL, LOCALE_NEUTRAL, DISPATCH_METHOD, &dispparams, &varresult, &excepinfo, NULL);
+    ok_ole_success(hr, ITypeInfo_Invoke);
+    ok(V_VT(&varresult) == VT_EMPTY, "varresult should be VT_EMPTY\n");
+    ok(V_VT(&vararg[0]) == (VT_UI4|VT_BYREF), "arg VT not unmarshalled correctly: %x\n", V_VT(&vararg[0]));
+    todo_wine
+    ok(V_UI4REF(&vararg[0]) == &uval, "Byref pointer not preserved: %p/%p\n", &uval, V_UI4REF(&vararg[0]));
+    ok(*V_UI4REF(&vararg[0]) == 42, "Expected 42 to be returned instead of %u\n", *V_UI4REF(&vararg[0]));
+    VariantClear(&varresult);
+    VariantClear(&vararg[0]);
+
     IDispatch_Release(pDispatch);
     IWidget_Release(pWidget);
 
diff --git a/dlls/oleaut32/tests/tmarshal.idl b/dlls/oleaut32/tests/tmarshal.idl
index 71d53cf09ad..41079d0b2c9 100644
--- a/dlls/oleaut32/tests/tmarshal.idl
+++ b/dlls/oleaut32/tests/tmarshal.idl
@@ -137,6 +137,9 @@ library TestTypelib
 
         [id(DISPID_TM_PROP_UINT), propget]
         HRESULT prop_uint([out,retval] UINT *i);
+
+        [id(DISPID_TM_BYREF_UINT)]
+        HRESULT ByRefUInt([in, out] UINT *i);
     }
 
     [
diff --git a/dlls/oleaut32/tests/tmarshal_dispids.h b/dlls/oleaut32/tests/tmarshal_dispids.h
index 08d77360f80..1cfd87b27c8 100644
--- a/dlls/oleaut32/tests/tmarshal_dispids.h
+++ b/dlls/oleaut32/tests/tmarshal_dispids.h
@@ -37,5 +37,6 @@
 #define DISPID_TM_PROP_WITH_LCID 18
 #define DISPID_TM_PROP_INT 19
 #define DISPID_TM_PROP_UINT 20
+#define DISPID_TM_BYREF_UINT 21
 
 #define DISPID_NOA_BSTRRET 1