diff --git a/dlls/winmm/wineoss/audio.c b/dlls/winmm/wineoss/audio.c
index f2f0dbe2e9b..2dfbeb8e487 100644
--- a/dlls/winmm/wineoss/audio.c
+++ b/dlls/winmm/wineoss/audio.c
@@ -712,7 +712,7 @@ static DWORD wodOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
 	WARN("can't open (%s)!\n", strerror(errno));
 	return MMSYSERR_ALLOCATED;
     }
-
+    fcntl(audio, F_SETFD, 1); /* set close on exec flag */
     wwo->unixdev = audio;
     wwo->wFlags = HIWORD(dwFlags & CALLBACK_TYPEMASK);
     
@@ -1736,6 +1736,7 @@ static DWORD widOpen(WORD wDevID, LPWAVEOPENDESC lpDesc, DWORD dwFlags)
 	WARN("can't open (%s)!\n", strerror(errno));
 	return MMSYSERR_ALLOCATED;
     }
+    fcntl(audio, F_SETFD, 1); /* set close on exec flag */
 
     wwi = &WInDev[wDevID];
     if (wwi->lpQueuePtr) {
diff --git a/dlls/winmm/wineoss/midi.c b/dlls/winmm/wineoss/midi.c
index 5363c760691..6f195701a81 100644
--- a/dlls/winmm/wineoss/midi.c
+++ b/dlls/winmm/wineoss/midi.c
@@ -402,6 +402,7 @@ static int midiOpenSeq(void)
 	    midiSeqFD = -1;
 	    return -1;
 	}
+	fcntl(midiSeqFD, F_SETFD, 1); /* set close on exec flag */
 	ioctl(midiSeqFD, SNDCTL_SEQ_RESET);
     }
     numOpenMidiSeq++;