diff --git a/libs/evoral/evoral/PatchChange.h b/libs/evoral/evoral/PatchChange.h
index 48a9a8c985..b1eecbd076 100644
--- a/libs/evoral/evoral/PatchChange.h
+++ b/libs/evoral/evoral/PatchChange.h
@@ -21,6 +21,8 @@
 #ifndef EVORAL_PATCH_CHANGE_HPP
 #define EVORAL_PATCH_CHANGE_HPP
 
+#include <cassert>
+
 #include "evoral/visibility.h"
 #include "evoral/Event.h"
 #include "evoral/Event.h"