diff --git a/libs/ardour/ardour/midi_buffer.h b/libs/ardour/ardour/midi_buffer.h
index 4a11980c42..573e5e11d4 100644
--- a/libs/ardour/ardour/midi_buffer.h
+++ b/libs/ardour/ardour/midi_buffer.h
@@ -190,7 +190,7 @@ private:
 
 	static size_t align32 (size_t s) {
 #if defined(__arm__) || defined(__aarch64__)
-		return ((s - 1) | 3) + 1
+		return ((s - 1) | 3) + 1;
 #else
 		return s;
 #endif