diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index 8a3474926e1..17e48c9f632 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -803,11 +803,11 @@ HINTERNET WINAPI HttpOpenRequestA(HINTERNET hHttpSession,
     if (lpszAcceptTypes)
     {
         /* find out how many there are */
-        while (lpszAcceptTypes[acceptTypesCount]) 
+        while (lpszAcceptTypes[acceptTypesCount] && *lpszAcceptTypes[acceptTypesCount])
             acceptTypesCount++;
         szAcceptTypes = HeapAlloc(GetProcessHeap(), 0, sizeof(WCHAR *) * (acceptTypesCount+1));
         acceptTypesCount = 0;
-        while (lpszAcceptTypes[acceptTypesCount])
+        while (lpszAcceptTypes[acceptTypesCount] && *lpszAcceptTypes[acceptTypesCount])
         {
             len = MultiByteToWideChar(CP_ACP, 0, lpszAcceptTypes[acceptTypesCount],
                                 -1, NULL, 0 );
@@ -1111,12 +1111,17 @@ HINTERNET WINAPI HTTP_HttpOpenRequestW(LPWININETHTTPSESSIONW lpwhs,
     if (NULL != lpszReferrer && strlenW(lpszReferrer))
         HTTP_ProcessHeader(lpwhr, HTTP_REFERER, lpszReferrer, HTTP_ADDHDR_FLAG_COALESCE);
 
-    if(lpszAcceptTypes!=NULL)
+    if (lpszAcceptTypes)
     {
         int i;
-        for(i=0;lpszAcceptTypes[i]!=NULL;i++)
+        for (i = 0; lpszAcceptTypes[i]; i++)
+        {
+            if (!*lpszAcceptTypes[i]) continue;
             HTTP_ProcessHeader(lpwhr, HTTP_ACCEPT, lpszAcceptTypes[i],
-                               HTTP_ADDHDR_FLAG_COALESCE_WITH_COMMA|HTTP_ADDHDR_FLAG_REQ|(i == 0 ? HTTP_ADDHDR_FLAG_REPLACE : 0));
+                               HTTP_ADDHDR_FLAG_COALESCE_WITH_COMMA |
+                               HTTP_ADDHDR_FLAG_REQ |
+                               (i == 0 ? HTTP_ADDHDR_FLAG_REPLACE : 0));
+        }
     }
 
     if (NULL == lpszVerb)
diff --git a/dlls/wininet/tests/http.c b/dlls/wininet/tests/http.c
index 876e616237d..664447d4ba6 100644
--- a/dlls/wininet/tests/http.c
+++ b/dlls/wininet/tests/http.c
@@ -632,6 +632,45 @@ done:
     ok(InternetCloseHandle(hSession), "Close session handle failed\n");
 }
 
+static void InternetOpenRequest_test(void)
+{
+    HINTERNET session, connect, request;
+    static const char *types[] = { "*", "", NULL };
+    static const WCHAR slash[] = {'/', 0}, any[] = {'*', 0}, empty[] = {0};
+    static const WCHAR *typesW[] = { any, empty, NULL };
+    BOOL ret;
+
+    session = InternetOpenA("Wine Regression Test", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
+    ok(session != NULL ,"Unable to open Internet session\n");
+
+    connect = InternetConnectA(session, "winehq.org", INTERNET_DEFAULT_HTTP_PORT, NULL, NULL,
+                              INTERNET_SERVICE_HTTP, 0, 0);
+    ok(connect != NULL, "Unable to connect to http://winehq.org\n");
+
+    request = HttpOpenRequestA(connect, NULL, "/", NULL, NULL, types, INTERNET_FLAG_NO_CACHE_WRITE, 0);
+    if (!request && GetLastError() == ERROR_INTERNET_NAME_NOT_RESOLVED)
+    {
+        trace( "Network unreachable, skipping test\n" );
+        goto done;
+    }
+    ok(request != NULL, "Failed to open request handle err %u\n", GetLastError());
+
+    ret = HttpSendRequest(request, NULL, 0, NULL, 0);
+    ok(ret, "HttpSendRequest failed: %u\n", GetLastError());
+    ok(InternetCloseHandle(request), "Close request handle failed\n");
+
+    request = HttpOpenRequestW(connect, NULL, slash, NULL, NULL, typesW, INTERNET_FLAG_NO_CACHE_WRITE, 0);
+    ok(request != NULL, "Failed to open request handle err %u\n", GetLastError());
+
+    ret = HttpSendRequest(request, NULL, 0, NULL, 0);
+    ok(ret, "HttpSendRequest failed: %u\n", GetLastError());
+    ok(InternetCloseHandle(request), "Close request handle failed\n");
+
+done:
+    ok(InternetCloseHandle(connect), "Close connect handle failed\n");
+    ok(InternetCloseHandle(session), "Close session handle failed\n");
+}
+
 static void HttpHeaders_test(void)
 {
     HINTERNET hSession;
@@ -1092,6 +1131,7 @@ START_TEST(http)
     InternetReadFile_test(INTERNET_FLAG_ASYNC);
     InternetReadFile_test(0);
     InternetReadFileExA_test(INTERNET_FLAG_ASYNC);
+    InternetOpenRequest_test();
     InternetOpenUrlA_test();
     InternetTimeFromSystemTimeA_test();
     InternetTimeFromSystemTimeW_test();