diff --git a/dlls/winmm/tests/capture.c b/dlls/winmm/tests/capture.c
index f148df49e5f..e0975df9a39 100644
--- a/dlls/winmm/tests/capture.c
+++ b/dlls/winmm/tests/capture.c
@@ -191,7 +191,7 @@ static void wave_in_test_deviceIn(int device, LPWAVEFORMATEX pwfx, DWORD format,
     /* Check that the position is 0 at start */
     check_position(device, win, 0, pwfx);
 
-    frag.lpData=malloc(pwfx->nAvgBytesPerSec);
+    frag.lpData=HeapAlloc(GetProcessHeap(), 0, pwfx->nAvgBytesPerSec);
     frag.dwBufferLength=pwfx->nAvgBytesPerSec;
     frag.dwBytesRecorded=0;
     frag.dwUser=0;
@@ -291,7 +291,7 @@ static void wave_in_test_deviceIn(int device, LPWAVEFORMATEX pwfx, DWORD format,
             trace("Unable to play back the recorded sound\n");
     }
 
-    free(frag.lpData);
+    HeapFree(GetProcessHeap(), 0, frag.lpData);
     CloseHandle(hevent);
 }
 
@@ -371,7 +371,7 @@ static void wave_in_test_device(int device)
        "waveInMessage(%s): failed to get interface size: rc=%s\n",
        dev_name(device),wave_in_error(rc));
     if (rc==MMSYSERR_NOERROR) {
-        nameW = (WCHAR *)malloc(size);
+        nameW = HeapAlloc(GetProcessHeap(), 0, size);
         rc=waveInMessage((HWAVEIN)device, DRV_QUERYDEVICEINTERFACE,
                          (DWORD_PTR)nameW, size);
         ok(rc==MMSYSERR_NOERROR,"waveInMessage(%s): failed to get interface "
@@ -379,11 +379,11 @@ static void wave_in_test_device(int device)
         ok(lstrlenW(nameW)+1==size/sizeof(WCHAR),
            "got an incorrect size %d\n", size);
         if (rc==MMSYSERR_NOERROR) {
-            nameA = malloc(size/sizeof(WCHAR));
+            nameA = HeapAlloc(GetProcessHeap(), 0, size/sizeof(WCHAR));
             WideCharToMultiByte(CP_ACP, 0, nameW, size/sizeof(WCHAR),
                                 nameA, size/sizeof(WCHAR), NULL, NULL);
         }
-        free(nameW);
+        HeapFree(GetProcessHeap(), 0, nameW);
     } else if (rc==MMSYSERR_NOTSUPPORTED) {
         nameA=strdup("not supported");
     }
@@ -394,7 +394,7 @@ static void wave_in_test_device(int device)
     trace("     channels=%d formats=%05x\n",
           capsA.wChannels,capsA.dwFormats);
 
-    free(nameA);
+    HeapFree(GetProcessHeap(), 0, nameA);
 
     for (f=0;f<NB_WIN_FORMATS;f++) {
         format.wFormatTag=WAVE_FORMAT_PCM;
diff --git a/dlls/winmm/tests/wave.c b/dlls/winmm/tests/wave.c
index 84a19fcd17a..93e406e2cda 100644
--- a/dlls/winmm/tests/wave.c
+++ b/dlls/winmm/tests/wave.c
@@ -58,7 +58,7 @@ static char* wave_generate_la(WAVEFORMATEX* wfx, double duration, DWORD* size)
 
     nb_samples=(int)(duration*wfx->nSamplesPerSec);
     *size=nb_samples*wfx->nBlockAlign;
-    b=buf=malloc(*size);
+    b=buf=HeapAlloc(GetProcessHeap(), 0, *size);
     for (i=0;i<nb_samples;i++) {
         double y=sin(440.0*2*PI*i/wfx->nSamplesPerSec);
         if (wfx->wBitsPerSample==8) {
@@ -117,7 +117,7 @@ static char* wave_generate_silence(WAVEFORMATEX* wfx, double duration, DWORD* si
 
     nb_samples=(int)(duration*wfx->nSamplesPerSec);
     *size=nb_samples*wfx->nBlockAlign;
-    b=buf=malloc(*size);
+    b=buf=HeapAlloc(GetProcessHeap(), 0, *size);
     for (i=0;i<nb_samples;i++) {
         if (wfx->wBitsPerSample==8) {
             for (j = 0; j < wfx->nChannels; j++)
@@ -656,7 +656,7 @@ static void wave_out_test_deviceOut(int device, double duration,
        pwfx->nSamplesPerSec, pwfx->wBitsPerSample,
        pwfx->nChannels, nSamplesPerSec, wBitsPerSample, nChannels);
 
-    frags = malloc(headers * sizeof(WAVEHDR));
+    frags = HeapAlloc(GetProcessHeap(), 0, headers * sizeof(WAVEHDR));
 
     if (sine)
         buffer=wave_generate_la(pwfx,duration / (loops + 1),&length);
@@ -779,7 +779,7 @@ static void wave_out_test_deviceOut(int device, double duration,
            "waveOutUnprepareHeader(%s): rc=%s\n",dev_name(device),
            wave_out_error(rc));
     }
-    free(buffer);
+    HeapFree(GetProcessHeap(), 0, buffer);
 
     rc=waveOutClose(wout);
     ok(rc==MMSYSERR_NOERROR,"waveOutClose(%s): rc=%s\n",dev_name(device),
@@ -791,7 +791,7 @@ EXIT:
         WaitForSingleObject(hevent,INFINITE);
     }
     CloseHandle(hevent);
-    free(frags);
+    HeapFree(GetProcessHeap(), 0, frags);
 }
 
 static void wave_out_test_device(int device)
@@ -870,18 +870,18 @@ static void wave_out_test_device(int device)
        "waveOutMessage(%s): failed to get interface size, rc=%s\n",
        dev_name(device),wave_out_error(rc));
     if (rc==MMSYSERR_NOERROR) {
-        nameW = (WCHAR *)malloc(size);
+        nameW = HeapAlloc(GetProcessHeap(), 0, size);
         rc=waveOutMessage((HWAVEOUT)device, DRV_QUERYDEVICEINTERFACE,
                           (DWORD_PTR)nameW, size);
         ok(rc==MMSYSERR_NOERROR,"waveOutMessage(%s): failed to get interface "
            "name, rc=%s\n",dev_name(device),wave_out_error(rc));
         ok(lstrlenW(nameW)+1==size/sizeof(WCHAR),"got an incorrect size %d\n",size);
         if (rc==MMSYSERR_NOERROR) {
-            nameA = malloc(size/sizeof(WCHAR));
+            nameA = HeapAlloc(GetProcessHeap(), 0, size/sizeof(WCHAR));
             WideCharToMultiByte(CP_ACP, 0, nameW, size/sizeof(WCHAR), nameA,
                                 size/sizeof(WCHAR), NULL, NULL);
         }
-        free(nameW);
+        HeapFree(GetProcessHeap(), 0, nameW);
     }
     else if (rc==MMSYSERR_NOTSUPPORTED) {
         nameA=strdup("not supported");
@@ -893,7 +893,7 @@ static void wave_out_test_device(int device)
     trace("     channels=%d formats=%05x support=%04x\n",
           capsA.wChannels,capsA.dwFormats,capsA.dwSupport);
     trace("     %s\n",wave_out_caps(capsA.dwSupport));
-    free(nameA);
+    HeapFree(GetProcessHeap(), 0, nameA);
 
     if (winetest_interactive && (device != WAVE_MAPPER))
     {