diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index eb842b1c7f..cb8b844119 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -1113,7 +1113,8 @@ HINTERNET WINAPI HTTP_HttpOpenRequestW(LPWININETHTTPSESSIONW lpwhs,
     {
         int i;
         for(i=0;lpszAcceptTypes[i]!=NULL;i++)
-            HTTP_ProcessHeader(lpwhr, HTTP_ACCEPT, lpszAcceptTypes[i], HTTP_ADDHDR_FLAG_COALESCE_WITH_COMMA|HTTP_ADDHDR_FLAG_REQ|HTTP_ADDHDR_FLAG_ADD_IF_NEW);
+            HTTP_ProcessHeader(lpwhr, HTTP_ACCEPT, lpszAcceptTypes[i],
+                               HTTP_ADDHDR_FLAG_COALESCE_WITH_COMMA|HTTP_ADDHDR_FLAG_REQ|(i == 0 ? HTTP_ADDHDR_FLAG_REPLACE : 0));
     }
 
     if (NULL == lpszVerb)