diff --git a/dlls/mciavi32/info.c b/dlls/mciavi32/info.c
index 0b5752a7548..247b37a95f6 100644
--- a/dlls/mciavi32/info.c
+++ b/dlls/mciavi32/info.c
@@ -28,7 +28,7 @@ WINE_DEFAULT_DEBUG_CHANNEL(mciavi);
 /**************************************************************************
  * 				MCIAVI_ConvertFrameToTimeFormat	[internal]
  */
-DWORD 	MCIAVI_ConvertFrameToTimeFormat(WINE_MCIAVI* wma, DWORD val, LPDWORD lpRet)
+static DWORD MCIAVI_ConvertFrameToTimeFormat(WINE_MCIAVI* wma, DWORD val, LPDWORD lpRet)
 {
     DWORD	   ret = 0;
 
diff --git a/dlls/mciavi32/private_mciavi.h b/dlls/mciavi32/private_mciavi.h
index 66003d761f4..548254c5a4f 100644
--- a/dlls/mciavi32/private_mciavi.h
+++ b/dlls/mciavi32/private_mciavi.h
@@ -85,7 +85,6 @@ typedef struct {
 extern HINSTANCE MCIAVI_hInstance;
 
 /* info.c */
-DWORD 	MCIAVI_ConvertFrameToTimeFormat(WINE_MCIAVI* wma, DWORD val, LPDWORD lpRet);
 DWORD 	MCIAVI_ConvertTimeFormatToFrame(WINE_MCIAVI* wma, DWORD val);
 DWORD	MCIAVI_mciGetDevCaps(UINT wDevID, DWORD dwFlags,  LPMCI_GETDEVCAPS_PARMS lpParms);
 DWORD	MCIAVI_mciInfo(UINT wDevID, DWORD dwFlags, LPMCI_DGV_INFO_PARMSW lpParms);