diff --git a/dlls/imaadp32.acm/imaadp32.c b/dlls/imaadp32.acm/imaadp32.c
index 4e59448295f..a315d06b0b7 100644
--- a/dlls/imaadp32.acm/imaadp32.c
+++ b/dlls/imaadp32.acm/imaadp32.c
@@ -37,14 +37,6 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(adpcm);
 
-/***********************************************************************
- *           ADPCM_drvOpen
- */
-static LRESULT ADPCM_drvOpen(LPCSTR str)
-{
-    return 1;
-}
-
 /***********************************************************************
  *           ADPCM_drvClose
  */
@@ -928,7 +920,7 @@ LRESULT CALLBACK ADPCM_DriverProc(DWORD_PTR dwDevID, HDRVR hDriv, UINT wMsg,
     {
     case DRV_LOAD:		return 1;
     case DRV_FREE:		return 1;
-    case DRV_OPEN:		return ADPCM_drvOpen((LPSTR)dwParam1);
+    case DRV_OPEN:		return 1;
     case DRV_CLOSE:		return ADPCM_drvClose(dwDevID);
     case DRV_ENABLE:		return 1;
     case DRV_DISABLE:		return 1;