diff --git a/libs/ardour/lv2_evbuf.cc b/libs/ardour/lv2_evbuf.cc
index 816f383963..3d609d57e7 100644
--- a/libs/ardour/lv2_evbuf.cc
+++ b/libs/ardour/lv2_evbuf.cc
@@ -35,6 +35,7 @@ struct ARDOUR::LV2_Evbuf {
 	uint32_t          capacity;
 	uint32_t          atom_Chunk;
 	uint32_t          atom_Sequence;
+	uint32_t          pad; // for 8byte alignment
 	LV2_Atom_Sequence atom;
 };