diff --git a/dlls/winmm/mmsystem.c b/dlls/winmm/mmsystem.c
index 17f94270952..6f62da3ff24 100644
--- a/dlls/winmm/mmsystem.c
+++ b/dlls/winmm/mmsystem.c
@@ -1366,7 +1366,7 @@ UINT WINAPI mixerMessage(HMIXER hmix, UINT uMsg, DWORD dwParam1, DWORD dwParam2)
 /**************************************************************************
  * 				mixerMessage		[MMSYSTEM.804]
  */
-UINT16 WINAPI mixerMessage16(HMIXER16 hmix, UINT16 uMsg, DWORD dwParam1, 
+DWORD WINAPI mixerMessage16(HMIXER16 hmix, UINT16 uMsg, DWORD dwParam1, 
 			     DWORD dwParam2) 
 {
     return mixerMessage(hmix, uMsg, dwParam1, dwParam2);
diff --git a/include/wine/mmsystem16.h b/include/wine/mmsystem16.h
index 6bd0bf7a714..37bd4d0e034 100644
--- a/include/wine/mmsystem16.h
+++ b/include/wine/mmsystem16.h
@@ -381,7 +381,7 @@ MMRESULT16	WINAPI joySetThreshold16(UINT16,UINT16);
 UINT16		WINAPI mixerGetNumDevs16(void);
 UINT16		WINAPI mixerOpen16(LPHMIXER16,UINT16,DWORD,DWORD,DWORD);
 UINT16		WINAPI mixerClose16(HMIXER16);
-UINT16		WINAPI mixerMessage16(HMIXER16,UINT16,DWORD,DWORD);
+DWORD		WINAPI mixerMessage16(HMIXER16,UINT16,DWORD,DWORD);
 UINT16		WINAPI mixerGetDevCaps16(UINT16,LPMIXERCAPS16,UINT16);
 UINT16		WINAPI mixerGetLineInfo16(HMIXEROBJ16,LPMIXERLINE16,DWORD);
 UINT16		WINAPI mixerGetID16(HMIXEROBJ16,LPUINT16,DWORD);