diff --git a/dlls/wininet/ftp.c b/dlls/wininet/ftp.c
index 1d9224b758d..a9f7166885a 100644
--- a/dlls/wininet/ftp.c
+++ b/dlls/wininet/ftp.c
@@ -1384,12 +1384,24 @@ BOOL WINAPI FtpDeleteFileW(HINTERNET hFtpSession, LPCWSTR lpszFileName)
     BOOL r = FALSE;
 
     lpwfs = (LPWININETFTPSESSIONW) WININET_GetObject( hFtpSession );
-    if (NULL == lpwfs || WH_HFTPSESSION != lpwfs->hdr.htype)
+    if (!lpwfs)
+    {
+        INTERNET_SetLastError(ERROR_INVALID_HANDLE);
+        return FALSE;
+    }
+
+    if (WH_HFTPSESSION != lpwfs->hdr.htype)
     {
         INTERNET_SetLastError(ERROR_INTERNET_INCORRECT_HANDLE_TYPE);
         goto lend;
     }
 
+    if (!lpszFileName)
+    {
+        INTERNET_SetLastError(ERROR_INVALID_PARAMETER);
+        goto lend;
+    }
+
     hIC = lpwfs->lpAppInfo;
     if (hIC->hdr.dwFlags & INTERNET_FLAG_ASYNC)
     {
@@ -1409,8 +1421,7 @@ BOOL WINAPI FtpDeleteFileW(HINTERNET hFtpSession, LPCWSTR lpszFileName)
     }
 
 lend:
-    if( lpwfs )
-        WININET_Release( &lpwfs->hdr );
+    WININET_Release( &lpwfs->hdr );
 
     return r;
 }
diff --git a/dlls/wininet/tests/ftp.c b/dlls/wininet/tests/ftp.c
index d5a4a6f2c1d..50ef6cc332e 100644
--- a/dlls/wininet/tests/ftp.c
+++ b/dlls/wininet/tests/ftp.c
@@ -167,7 +167,6 @@ static void test_deletefile(void)
     SetLastError(0xdeadbeef);
     bRet = FtpDeleteFileA(NULL, "non_existent_file_deadbeef");
     ok ( bRet == FALSE, "Expected FtpDeleteFileA to fail\n");
-    todo_wine
     ok ( GetLastError() == ERROR_INVALID_HANDLE,
         "Expected ERROR_INVALID_HANDLE, got %d\n", GetLastError());
 
@@ -186,7 +185,6 @@ static void test_deletefile(void)
     SetLastError(0xdeadbeef);
     bRet = FtpDeleteFileA(hFtp, NULL);
     ok ( bRet == FALSE, "Expected FtpDeleteFileA to fail\n");
-    todo_wine
     ok ( GetLastError() == ERROR_INVALID_PARAMETER,
         "Expected ERROR_INVALID_PARAMETER, got %d\n", GetLastError());