diff --git a/dlls/winmm/tests/mixer.c b/dlls/winmm/tests/mixer.c
index 6cd1c7a..89ac7c9 100644
--- a/dlls/winmm/tests/mixer.c
+++ b/dlls/winmm/tests/mixer.c
@@ -382,12 +382,6 @@ static void mixer_test_deviceA(int device)
         ok(rc==MMSYSERR_INVALFLAG,
            "mixerOpen: MMSYSERR_INVALFLAG expected, got %s\n", mmsys_error(rc));
 
-        /* Shouldn't open without a valid HWND */
-        rc=mixerOpen(&mix, device, 0, 0, CALLBACK_WINDOW);
-        ok(rc==MMSYSERR_INVALPARAM,
-           "mixerOpen: MMSYSERR_INVALPARAM expected, got %s\n", mmsys_error(rc));
-
-
         for (d=0;d<capsA.cDestinations;d++) {
             MIXERLINEA mixerlineA;
             mixerlineA.cbStruct = 0;
@@ -775,11 +769,6 @@ static void mixer_test_deviceW(int device)
         ok(rc==MMSYSERR_INVALFLAG,
            "mixerOpen: MMSYSERR_INVALFLAG expected, got %s\n", mmsys_error(rc));
 
-        /* Shouldn't open without a valid HWND */
-        rc=mixerOpen(&mix, device, 0, 0, CALLBACK_WINDOW);
-        ok(rc==MMSYSERR_INVALPARAM,
-           "mixerOpen: MMSYSERR_INVALPARAM expected, got %s\n", mmsys_error(rc));
-
         for (d=0;d<capsW.cDestinations;d++) {
             MIXERLINEW mixerlineW;
             mixerlineW.cbStruct = 0;
-- 
1.5.4.3