diff --git a/lib-src/libnyquist/nyx.c b/lib-src/libnyquist/nyx.c
index b2ec0e3a5..95c6b7dfc 100644
--- a/lib-src/libnyquist/nyx.c
+++ b/lib-src/libnyquist/nyx.c
@@ -1422,7 +1422,7 @@ static int osdir_list_status = OSDIR_LIST_READY;
 static char osdir_path[OSDIR_MAX_PATH];
 
 // osdir_list_start -- prepare to list a directory
-int osdir_list_start(char *path)
+int osdir_list_start(const char *path)
 {
    if (strlen(path) >= OSDIR_MAX_PATH - 2) {
       xlcerror("LISTDIR path too big", "return nil", NULL);
diff --git a/lib-src/portmixer/src/px_win_common.c b/lib-src/portmixer/src/px_win_common.c
index cde91492c..14c2e54b0 100644
--- a/lib-src/portmixer/src/px_win_common.c
+++ b/lib-src/portmixer/src/px_win_common.c
@@ -105,14 +105,14 @@ int open_mixers(px_mixer *Px, UINT deviceIn, UINT deviceOut)
       return open_ep_mixers(Px, deviceIn, deviceOut);
    }
 
-   res = mixerGetID((HMIXEROBJ) (deviceIn == WAVE_MAPPER ? 0 : deviceIn),
+   res = mixerGetID((HMIXEROBJ) (UINT_PTR) (deviceIn == WAVE_MAPPER ? 0 : deviceIn),
                     &deviceIn,
                     MIXER_OBJECTF_WAVEIN);
    if (res != MMSYSERR_NOERROR) {
       return FALSE;
    }
 
-   res = mixerGetID((HMIXEROBJ) (deviceOut == WAVE_MAPPER ? 0 : deviceOut),
+   res = mixerGetID((HMIXEROBJ) (UINT_PTR) (deviceOut == WAVE_MAPPER ? 0 : deviceOut),
                     &deviceOut,
                     MIXER_OBJECTF_WAVEOUT);
    if (res != MMSYSERR_NOERROR) {
@@ -426,7 +426,7 @@ static const char *get_mixer_name(px_mixer *Px, int i)
 
    if (i == 0) {
       if (!info->inName) {
-         res = mixerGetDevCaps((UINT) info->hInputMixer, &caps, sizeof(caps));
+         res = mixerGetDevCaps((UINT_PTR) info->hInputMixer, &caps, sizeof(caps));
          if (res == MMSYSERR_NOERROR) {
             info->inName = strdup(caps.szPname);
          }
@@ -435,7 +435,7 @@ static const char *get_mixer_name(px_mixer *Px, int i)
    }
 
    if (!info->outName) {
-      res = mixerGetDevCaps((UINT) info->hOutputMixer, &caps, sizeof(caps));
+      res = mixerGetDevCaps((UINT_PTR) info->hOutputMixer, &caps, sizeof(caps));
       if (res == MMSYSERR_NOERROR) {
          info->outName = strdup(caps.szPname);
       }
diff --git a/lib-src/portmixer/src/px_win_wasapi.c b/lib-src/portmixer/src/px_win_wasapi.c
index d5f5863a9..01df5573b 100644
--- a/lib-src/portmixer/src/px_win_wasapi.c
+++ b/lib-src/portmixer/src/px_win_wasapi.c
@@ -67,8 +67,8 @@ static void dprintf(const char *format, ...)
 
 int OpenMixer_Win_WASAPI(px_mixer *Px, int index)
 {
-   wchar_t *deviceIn = PaWasapi_GetInputDeviceID(Px->pa_stream);
-   wchar_t *deviceOut = PaWasapi_GetOutputDeviceID(Px->pa_stream);
+   const wchar_t *deviceIn = PaWasapi_GetInputDeviceID(Px->pa_stream);
+   const wchar_t *deviceOut = PaWasapi_GetOutputDeviceID(Px->pa_stream);
    int ret = FALSE;
 
    if (open_ep_mixers_byid(Px, deviceIn, deviceOut))