diff --git a/libs/ardour/vst3_host.cc b/libs/ardour/vst3_host.cc
index c491dee88d..9bed8a2e45 100644
--- a/libs/ardour/vst3_host.cc
+++ b/libs/ardour/vst3_host.cc
@@ -891,7 +891,7 @@ ROMStream::ROMStream (IBStream& src, TSize offset, TSize size)
 	: _stream (src)
 	, _offset (offset)
 	, _size   (size)
-	, _pos   (size)
+	, _pos   (0)
 {
 	_stream.addRef ();
 }