diff --git a/dlls/winmm/winealsa/audio.c b/dlls/winmm/winealsa/audio.c
index 674bc5f641..af81e8723e 100644
--- a/dlls/winmm/winealsa/audio.c
+++ b/dlls/winmm/winealsa/audio.c
@@ -1436,7 +1436,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
@@ -2920,7 +2921,8 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
diff --git a/dlls/winmm/winearts/audio.c b/dlls/winmm/winearts/audio.c
index 1b30f7f9f2..c27ccb5bf9 100644
--- a/dlls/winmm/winearts/audio.c
+++ b/dlls/winmm/winearts/audio.c
@@ -1104,7 +1104,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
@@ -1785,7 +1786,8 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is support so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
diff --git a/dlls/winmm/wineaudioio/audio.c b/dlls/winmm/wineaudioio/audio.c
index 7523edc748..fd55e62440 100644
--- a/dlls/winmm/wineaudioio/audio.c
+++ b/dlls/winmm/wineaudioio/audio.c
@@ -772,7 +772,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
@@ -1974,7 +1975,8 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
diff --git a/dlls/winmm/winejack/audio.c b/dlls/winmm/winejack/audio.c
index 7b93595da7..43275d52c9 100644
--- a/dlls/winmm/winejack/audio.c
+++ b/dlls/winmm/winejack/audio.c
@@ -1241,7 +1241,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
       lpDesc->lpFormat->nChannels == 0 ||
-      lpDesc->lpFormat->nSamplesPerSec == 0)
+      lpDesc->lpFormat->nSamplesPerSec == 0 ||
+      (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16))
     {
       WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
        lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
@@ -1319,8 +1320,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* check for an invalid number of bits per sample */
     if (wwo->format.wBitsPerSample == 0)
     {
-      WARN("Resetting zeroed wBitsPerSample to 16\n");
-      wwo->format.wBitsPerSample = 16 *
+      WARN("Resetting zeroed wBitsPerSample\n");
+      wwo->format.wBitsPerSample = 8 *
       (wwo->format.wf.nAvgBytesPerSec /
        wwo->format.wf.nSamplesPerSec) /
        wwo->format.wf.nChannels;
@@ -2113,7 +2114,8 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
       lpDesc->lpFormat->nChannels == 0 ||
-      lpDesc->lpFormat->nSamplesPerSec == 0)
+      lpDesc->lpFormat->nSamplesPerSec == 0 ||
+      (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16))
     {
       WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
        lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
@@ -2183,8 +2185,8 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* check for an invalid number of bits per sample */
     if (wwi->format.wBitsPerSample == 0)
     {
-      WARN("Resetting zeroed wBitsPerSample to 16\n");
-      wwi->format.wBitsPerSample = 16 *
+      WARN("Resetting zeroed wBitsPerSample\n");
+      wwi->format.wBitsPerSample = 8 *
       (wwi->format.wf.nAvgBytesPerSec /
        wwi->format.wf.nSamplesPerSec) /
        wwi->format.wf.nChannels;
diff --git a/dlls/winmm/winenas/audio.c b/dlls/winmm/winenas/audio.c
index 5267587813..0b92739e96 100644
--- a/dlls/winmm/winenas/audio.c
+++ b/dlls/winmm/winenas/audio.c
@@ -882,7 +882,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
diff --git a/dlls/winmm/wineoss/audio.c b/dlls/winmm/wineoss/audio.c
index 35ef93548c..da9a1dd674 100644
--- a/dlls/winmm/wineoss/audio.c
+++ b/dlls/winmm/wineoss/audio.c
@@ -1665,7 +1665,8 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);
@@ -3507,7 +3508,8 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
     /* only PCM format is supported so far... */
     if (lpDesc->lpFormat->wFormatTag != WAVE_FORMAT_PCM ||
 	lpDesc->lpFormat->nChannels == 0 ||
-	lpDesc->lpFormat->nSamplesPerSec == 0) {
+	lpDesc->lpFormat->nSamplesPerSec == 0 ||
+        (lpDesc->lpFormat->wBitsPerSample!=8 && lpDesc->lpFormat->wBitsPerSample!=16)) {
 	WARN("Bad format: tag=%04X nChannels=%d nSamplesPerSec=%ld !\n",
 	     lpDesc->lpFormat->wFormatTag, lpDesc->lpFormat->nChannels,
 	     lpDesc->lpFormat->nSamplesPerSec);