diff --git a/libs/ardour/ardour/step_sequencer.h b/libs/ardour/ardour/step_sequencer.h
index 629ed60f1c..c9dd34a40d 100644
--- a/libs/ardour/ardour/step_sequencer.h
+++ b/libs/ardour/ardour/step_sequencer.h
@@ -32,7 +32,7 @@
 #include "pbd/ringbuffer.h"
 #include "pbd/stateful.h"
 
-#include "evoral/Event.hpp"
+#include "evoral/Event.h"
 
 #include "temporal/types.h"
 #include "temporal/beats.h"