diff --git a/dlls/oleaut32/olefont.c b/dlls/oleaut32/olefont.c
index 01dd14e340d..af18428df1e 100644
--- a/dlls/oleaut32/olefont.c
+++ b/dlls/oleaut32/olefont.c
@@ -1402,6 +1402,41 @@ static HRESULT WINAPI OLEFontImpl_Invoke(
   OLEFontImpl *this = impl_from_IDispatch(iface);
   HRESULT hr;
 
+  /* validate parameters */
+
+  if (!IsEqualIID(riid, &IID_NULL))
+  {
+    ERR("riid was %s instead of IID_NULL\n", debugstr_guid(riid));
+    return DISP_E_UNKNOWNINTERFACE;
+  }
+
+  if (wFlags & DISPATCH_PROPERTYGET)
+  {
+    if (!pVarResult)
+    {
+      ERR("null pVarResult not allowed when DISPATCH_PROPERTYGET specified\n");
+      return DISP_E_PARAMNOTOPTIONAL;
+    }
+  }
+  else if (wFlags & DISPATCH_PROPERTYPUT)
+  {
+    if (!pDispParams)
+    {
+      ERR("null pDispParams not allowed when DISPATCH_PROPERTYPUT specified\n");
+      return DISP_E_PARAMNOTOPTIONAL;
+    }
+    if (pDispParams->cArgs != 1)
+    {
+      ERR("param count for DISPATCH_PROPERTYPUT was %ld instead of 1\n", pDispParams->cArgs);
+      return DISP_E_BADPARAMCOUNT;
+    }
+  }
+  else
+  {
+    ERR("one of DISPATCH_PROPERTYGET or DISPATCH_PROPERTYPUT must be specified\n");
+    return DISP_E_MEMBERNOTFOUND;
+  }
+
   switch (dispIdMember) {
   case DISPID_FONT_NAME:
     if (wFlags & DISPATCH_PROPERTYGET) {
diff --git a/dlls/oleaut32/tests/olefont.c b/dlls/oleaut32/tests/olefont.c
index 1640f796ece..423cb4d9a58 100644
--- a/dlls/oleaut32/tests/olefont.c
+++ b/dlls/oleaut32/tests/olefont.c
@@ -425,6 +425,39 @@ void test_GetIDsOfNames(void)
                    DISPID_FONT_NAME, 0, S_OK,1);
 }
 
+static void test_Invoke(void)
+{
+    IFontDisp *fontdisp;
+    HRESULT hr;
+    VARIANTARG vararg;
+    DISPPARAMS dispparams;
+
+    hr = pOleCreateFontIndirect(NULL, &IID_IFontDisp, (void **)&fontdisp);
+    ok_ole_success(hr, "OleCreateFontIndirect\n");
+
+    V_VT(&vararg) = VT_BOOL;
+    V_BOOL(&vararg) = FALSE;
+    dispparams.cNamedArgs = 0;
+    dispparams.rgdispidNamedArgs = NULL;
+    dispparams.cArgs = 1;
+    dispparams.rgvarg = &vararg;
+    hr = IFontDisp_Invoke(fontdisp, DISPID_FONT_BOLD, &IID_IFontDisp, 0, DISPATCH_PROPERTYPUT, &dispparams, NULL, NULL, NULL);
+    ok(hr == DISP_E_UNKNOWNINTERFACE, "IFontDisp_Invoke should have returned DISP_E_UNKNOWNINTERFACE instead of 0x%08lx\n", hr);
+
+    dispparams.cArgs = 0;
+    dispparams.rgvarg = NULL;
+    hr = IFontDisp_Invoke(fontdisp, DISPID_FONT_BOLD, &IID_NULL, 0, DISPATCH_PROPERTYPUT, &dispparams, NULL, NULL, NULL);
+    ok(hr == DISP_E_BADPARAMCOUNT, "IFontDisp_Invoke should have returned DISP_E_BADPARAMCOUNT instead of 0x%08lx\n", hr);
+
+    hr = IFontDisp_Invoke(fontdisp, DISPID_FONT_BOLD, &IID_NULL, 0, DISPATCH_PROPERTYPUT, NULL, NULL, NULL, NULL);
+    ok(hr == DISP_E_PARAMNOTOPTIONAL, "IFontDisp_Invoke should have returned DISP_E_PARAMNOTOPTIONAL instead of 0x%08lx\n", hr);
+
+    hr = IFontDisp_Invoke(fontdisp, DISPID_FONT_BOLD, &IID_NULL, 0, DISPATCH_PROPERTYGET, NULL, NULL, NULL, NULL);
+    ok(hr == DISP_E_PARAMNOTOPTIONAL, "IFontDisp_Invoke should have returned DISP_E_PARAMNOTOPTIONAL instead of 0x%08lx\n", hr);
+
+    IFontDisp_Release(fontdisp);
+}
+
 START_TEST(olefont)
 {
 	hOleaut32 = LoadLibraryA("oleaut32.dll");    
@@ -447,4 +480,5 @@ START_TEST(olefont)
 
 	test_font_events_disp();
 	test_GetIDsOfNames();
+	test_Invoke();
 }