diff --git a/dlls/jscript/jsutils.c b/dlls/jscript/jsutils.c
index 87bad26fe95..a324c963068 100644
--- a/dlls/jscript/jsutils.c
+++ b/dlls/jscript/jsutils.c
@@ -327,6 +327,9 @@ HRESULT variant_to_jsval(VARIANT *var, jsval_t *r)
                 *r = jsval_disp(disp);
                 return S_OK;
             }
+        }else {
+            *r = jsval_disp(NULL);
+            return S_OK;
         }
         /* fall through */
     default:
diff --git a/dlls/jscript/tests/run.c b/dlls/jscript/tests/run.c
index 0db3660f0b5..a92282a0d6b 100644
--- a/dlls/jscript/tests/run.c
+++ b/dlls/jscript/tests/run.c
@@ -1156,7 +1156,7 @@ static HRESULT WINAPI Global_InvokeEx(IDispatchEx *iface, DISPID id, LCID lcid,
         return S_OK;
 
     case DISPID_GLOBAL_TESTARGTYPES: {
-        VARIANT args[3];
+        VARIANT args[4];
         DISPPARAMS dp = {args, NULL, sizeof(args)/sizeof(*args), 0};
         HRESULT hres;
 
@@ -1190,6 +1190,8 @@ static HRESULT WINAPI Global_InvokeEx(IDispatchEx *iface, DISPID id, LCID lcid,
         V_INT(args+1) = 22;
         V_VT(args+2) = VT_UNKNOWN;
         V_UNKNOWN(args+2) = (IUnknown*)&testObj;
+        V_VT(args+3) = VT_UNKNOWN;
+        V_UNKNOWN(args+3) = NULL;
         hres = IDispatch_Invoke(V_DISPATCH(pdp->rgvarg), DISPID_VALUE, &IID_NULL, 0, DISPATCH_METHOD, &dp, NULL, NULL, NULL);
         ok(hres == S_OK, "Invoke failed: %08x\n", hres);
 
@@ -2140,10 +2142,12 @@ static BOOL run_tests(void)
     CHECK_CALLED(global_propargput_i);
 
     SET_EXPECT(global_testargtypes_i);
-    parse_script_a("testArgTypes(dispUnk, intProp(), intProp, getShort(), shortProp, function(d,i,s) {"
+    parse_script_a("testArgTypes(dispUnk, intProp(), intProp, getShort(), shortProp, function(nullunk,d,i,s) {"
                    "    ok(getVT(i) === 'VT_I4', 'getVT(i) = ' + getVT(i));"
                    "    ok(getVT(s) === 'VT_I4', 'getVT(s) = ' + getVT(s));"
                    "    ok(getVT(d) === 'VT_DISPATCH', 'getVT(d) = ' + getVT(d));"
+                   "    ok(getVT(nullunk) === 'VT_DISPATCH', 'getVT(nullunk) = ' + getVT(nullunk));"
+                   "    ok(nullunk === null, 'nullunk !== null');"
                    "});");
     CHECK_CALLED(global_testargtypes_i);