diff --git a/src/add-ons/media/plugins/http_streamer/HTTPMediaIO.cpp b/src/add-ons/media/plugins/http_streamer/HTTPMediaIO.cpp
index bc9df16997..7166c8b22e 100644
--- a/src/add-ons/media/plugins/http_streamer/HTTPMediaIO.cpp
+++ b/src/add-ons/media/plugins/http_streamer/HTTPMediaIO.cpp
@@ -43,12 +43,15 @@ public:
 
 		void ConnectionOpened(BUrlRequest* request)
 		{
-			fAdapterIO->UpdateSize();
-
 			fRequest = request;
 			fRunning = true;
 		}
 
+		void HeadersReceived(BUrlRequest* request)
+		{
+			fAdapterIO->UpdateSize();
+		}
+
 		void DataReceived(BUrlRequest* request, const char* data,
 			off_t position, ssize_t size)
 		{