diff --git a/dlls/winmm/mci.c b/dlls/winmm/mci.c
index 6fca0138128..216fb2a0fed 100644
--- a/dlls/winmm/mci.c
+++ b/dlls/winmm/mci.c
@@ -2393,6 +2393,7 @@ YIELDPROC WINAPI mciGetYieldProc(MCIDEVICEID uDeviceID, DWORD* lpdwYieldData)
 	WARN("Proc is 32 bit\n");
 	return NULL;
     }
+    if (lpdwYieldData) *lpdwYieldData = wmd->dwYieldData;
     return wmd->lpfnYieldProc;
 }
 
diff --git a/dlls/winmm/mmsystem.c b/dlls/winmm/mmsystem.c
index 4f320f7b136..fd065d070cb 100644
--- a/dlls/winmm/mmsystem.c
+++ b/dlls/winmm/mmsystem.c
@@ -647,6 +647,7 @@ YIELDPROC16 WINAPI mciGetYieldProc16(UINT16 uDeviceID, DWORD* lpdwYieldData)
 	WARN("Proc is 32 bit\n");
 	return NULL;
     }
+    if (lpdwYieldData) *lpdwYieldData = wmd->dwYieldData;
     return (YIELDPROC16)wmd->lpfnYieldProc;
 }