diff --git a/dlls/msvideo.dll16/msvideo16.c b/dlls/msvideo.dll16/msvideo16.c
index 1b715e4c68e..8f02cc1ebc8 100644
--- a/dlls/msvideo.dll16/msvideo16.c
+++ b/dlls/msvideo.dll16/msvideo16.c
@@ -988,6 +988,7 @@ static LRESULT WINAPI MCIWndProc16(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lp
     switch (msg)
     {
     case MCIWNDM_SENDSTRINGA:
+    case MCIWNDM_SETTIMEFORMATA:
         lparam = (ULONG_PTR)MapSL(lparam);
         break;