diff --git a/libs/ardour/audiosource.cc b/libs/ardour/audiosource.cc
index 25efd13785..5e4cc763ed 100644
--- a/libs/ardour/audiosource.cc
+++ b/libs/ardour/audiosource.cc
@@ -49,7 +49,7 @@ using Glib::ustring;
 bool AudioSource::_build_missing_peakfiles = false;
 bool AudioSource::_build_peakfiles = false;
 
-#define _FPP 2048
+#define _FPP 256
 
 AudioSource::AudioSource (Session& s, ustring name)
 	: Source (s, name)