diff --git a/dlls/winealsa.drv/midi.c b/dlls/winealsa.drv/midi.c
index 7c51d347240..068165e8f9d 100644
--- a/dlls/winealsa.drv/midi.c
+++ b/dlls/winealsa.drv/midi.c
@@ -1158,7 +1158,7 @@ static void ALSA_AddMidiPort(snd_seq_client_info_t* cinfo, snd_seq_port_info_t*
 	    lstrcpynA(midiPortName, snd_seq_port_info_get_name(pinfo), MAXPNAMELEN-1);
 	    midiPortName[MAXPNAMELEN-1] = 0;
 	}
-	MultiByteToWideChar(CP_ACP, 0, midiPortName, -1,
+	MultiByteToWideChar(CP_UNIXCP, 0, midiPortName, -1,
                             MidiOutDev[MODM_NumDevs].caps.szPname,
                             sizeof(MidiOutDev[MODM_NumDevs].caps.szPname) / sizeof(WCHAR));
 
@@ -1223,7 +1223,7 @@ static void ALSA_AddMidiPort(snd_seq_client_info_t* cinfo, snd_seq_port_info_t*
 	    lstrcpynA(midiPortName, snd_seq_port_info_get_name(pinfo), MAXPNAMELEN-1);
 	    midiPortName[MAXPNAMELEN-1] = 0;
         }
-	MultiByteToWideChar(CP_ACP, 0, midiPortName, -1,
+	MultiByteToWideChar(CP_UNIXCP, 0, midiPortName, -1,
                             MidiInDev[MIDM_NumDevs].caps.szPname,
                             sizeof(MidiInDev[MIDM_NumDevs].caps.szPname) / sizeof(WCHAR));
 	MidiInDev[MIDM_NumDevs].state = 0;
diff --git a/dlls/winealsa.drv/wavein.c b/dlls/winealsa.drv/wavein.c
index af62bcf4ce7..603d62ce4ad 100644
--- a/dlls/winealsa.drv/wavein.c
+++ b/dlls/winealsa.drv/wavein.c
@@ -719,7 +719,7 @@ static DWORD widDevInterfaceSize(UINT wDevID, LPDWORD dwParam1)
 {
     TRACE("(%u, %p)\n", wDevID, dwParam1);
 
-    *dwParam1 = MultiByteToWideChar(CP_ACP, 0, WInDev[wDevID].interface_name, -1,
+    *dwParam1 = MultiByteToWideChar(CP_UNIXCP, 0, WInDev[wDevID].interface_name, -1,
                                     NULL, 0 ) * sizeof(WCHAR);
     return MMSYSERR_NOERROR;
 }
@@ -729,10 +729,10 @@ static DWORD widDevInterfaceSize(UINT wDevID, LPDWORD dwParam1)
  */
 static DWORD widDevInterface(UINT wDevID, PWCHAR dwParam1, DWORD dwParam2)
 {
-    if (dwParam2 >= MultiByteToWideChar(CP_ACP, 0, WInDev[wDevID].interface_name, -1,
+    if (dwParam2 >= MultiByteToWideChar(CP_UNIXCP, 0, WInDev[wDevID].interface_name, -1,
                                         NULL, 0 ) * sizeof(WCHAR))
     {
-        MultiByteToWideChar(CP_ACP, 0, WInDev[wDevID].interface_name, -1,
+        MultiByteToWideChar(CP_UNIXCP, 0, WInDev[wDevID].interface_name, -1,
                             dwParam1, dwParam2 / sizeof(WCHAR));
         return MMSYSERR_NOERROR;
     }
diff --git a/dlls/winealsa.drv/waveinit.c b/dlls/winealsa.drv/waveinit.c
index 1516aa63735..4bdaeff3d34 100644
--- a/dlls/winealsa.drv/waveinit.c
+++ b/dlls/winealsa.drv/waveinit.c
@@ -490,7 +490,7 @@ static int ALSA_AddPlaybackDevice(snd_ctl_t *ctl, snd_pcm_t *pcm, const char *pc
     if (rc)
         return(rc);
 
-    MultiByteToWideChar(CP_ACP, 0, wwo.ds_desc.szDesc, -1,
+    MultiByteToWideChar(CP_UNIXCP, 0, wwo.ds_desc.szDesc, -1,
                         wwo.outcaps.szPname, sizeof(wwo.outcaps.szPname)/sizeof(WCHAR));
     wwo.outcaps.szPname[sizeof(wwo.outcaps.szPname)/sizeof(WCHAR) - 1] = '\0';
 
@@ -530,7 +530,7 @@ static int ALSA_AddCaptureDevice(snd_ctl_t *ctl, snd_pcm_t *pcm, const char *pcm
     if (rc)
         return(rc);
 
-    MultiByteToWideChar(CP_ACP, 0, wwi.ds_desc.szDesc, -1,
+    MultiByteToWideChar(CP_UNIXCP, 0, wwi.ds_desc.szDesc, -1,
                         wwi.incaps.szPname, sizeof(wwi.incaps.szPname) / sizeof(WCHAR));
     wwi.incaps.szPname[sizeof(wwi.incaps.szPname)/sizeof(WCHAR) - 1] = '\0';
 
diff --git a/dlls/winealsa.drv/waveout.c b/dlls/winealsa.drv/waveout.c
index 8f18d3c1660..9dae6f405ac 100644
--- a/dlls/winealsa.drv/waveout.c
+++ b/dlls/winealsa.drv/waveout.c
@@ -1131,7 +1131,7 @@ static DWORD wodDevInterfaceSize(UINT wDevID, LPDWORD dwParam1)
 {
     TRACE("(%u, %p)\n", wDevID, dwParam1);
 
-    *dwParam1 = MultiByteToWideChar(CP_ACP, 0, WOutDev[wDevID].interface_name, -1,
+    *dwParam1 = MultiByteToWideChar(CP_UNIXCP, 0, WOutDev[wDevID].interface_name, -1,
                                     NULL, 0 ) * sizeof(WCHAR);
     return MMSYSERR_NOERROR;
 }
@@ -1141,10 +1141,10 @@ static DWORD wodDevInterfaceSize(UINT wDevID, LPDWORD dwParam1)
  */
 static DWORD wodDevInterface(UINT wDevID, PWCHAR dwParam1, DWORD dwParam2)
 {
-    if (dwParam2 >= MultiByteToWideChar(CP_ACP, 0, WOutDev[wDevID].interface_name, -1,
+    if (dwParam2 >= MultiByteToWideChar(CP_UNIXCP, 0, WOutDev[wDevID].interface_name, -1,
                                         NULL, 0 ) * sizeof(WCHAR))
     {
-        MultiByteToWideChar(CP_ACP, 0, WOutDev[wDevID].interface_name, -1,
+        MultiByteToWideChar(CP_UNIXCP, 0, WOutDev[wDevID].interface_name, -1,
                             dwParam1, dwParam2 / sizeof(WCHAR));
 	return MMSYSERR_NOERROR;
     }