diff --git a/dlls/avifil32/api.c b/dlls/avifil32/api.c
index 0494bfc59e4..e4fb64ff3ee 100644
--- a/dlls/avifil32/api.c
+++ b/dlls/avifil32/api.c
@@ -2233,7 +2233,7 @@ HRESULT WINAPI AVIPutFileOnClipboard(PAVIFILE pfile)
 HRESULT WINAPIV AVISaveA(LPCSTR szFile, CLSID * pclsidHandler, AVISAVECALLBACK lpfnCallback,
                         int nStreams, PAVISTREAM pavi, LPAVICOMPRESSOPTIONS lpOptions, ...)
 {
-    __ms_va_list vl;
+    va_list vl;
     int i;
     HRESULT ret;
     PAVISTREAM *streams;
@@ -2255,13 +2255,13 @@ HRESULT WINAPIV AVISaveA(LPCSTR szFile, CLSID * pclsidHandler, AVISAVECALLBACK l
     streams[0] = pavi;
     options[0] = lpOptions;
 
-    __ms_va_start(vl, lpOptions);
+    va_start(vl, lpOptions);
     for (i = 1; i < nStreams; i++)
     {
         streams[i] = va_arg(vl, PAVISTREAM);
         options[i] = va_arg(vl, PAVICOMPRESSOPTIONS);
     }
-    __ms_va_end(vl);
+    va_end(vl);
 
     for (i = 0; i < nStreams; i++)
         TRACE("Pair[%d] - Stream = %p, Options = %p\n", i, streams[i], options[i]);
@@ -2276,7 +2276,7 @@ error:
 HRESULT WINAPIV AVISaveW(LPCWSTR szFile, CLSID * pclsidHandler, AVISAVECALLBACK lpfnCallback,
                         int nStreams, PAVISTREAM pavi, LPAVICOMPRESSOPTIONS lpOptions, ...)
 {
-    __ms_va_list vl;
+    va_list vl;
     int i;
     HRESULT ret;
     PAVISTREAM *streams;
@@ -2298,13 +2298,13 @@ HRESULT WINAPIV AVISaveW(LPCWSTR szFile, CLSID * pclsidHandler, AVISAVECALLBACK
     streams[0] = pavi;
     options[0] = lpOptions;
 
-    __ms_va_start(vl, lpOptions);
+    va_start(vl, lpOptions);
     for (i = 1; i < nStreams; i++)
     {
         streams[i] = va_arg(vl, PAVISTREAM);
         options[i] = va_arg(vl, PAVICOMPRESSOPTIONS);
     }
-    __ms_va_end(vl);
+    va_end(vl);
 
     for (i = 0; i < nStreams; i++)
         TRACE("Pair[%d] - Stream = %p, Options = %p\n", i, streams[i], options[i]);