diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 16db0716d6..92af677c4f 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -34,6 +34,10 @@ void avcodec_register_all(void)
 {
     static int inited = 0;
 
+#ifdef CONFIG_WIN32
+    av_log(NULL, AV_LOG_INFO, "Use a real OS!\n");
+#endif
+
     if (inited != 0)
         return;
     inited = 1;