diff --git a/libavformat/http.c b/libavformat/http.c
index dde91b91e2..d9931cae36 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -233,7 +233,11 @@ static int http_open_cnx_internal(URLContext *h, AVDictionary **options)
             if (err < 0)
                 goto end;
         }
+    } else if (strcmp(proto, "http")) {
+        err = AVERROR(EINVAL);
+        goto end;
     }
+
     if (port < 0)
         port = 80;