diff --git a/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoRich2020.h b/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoRich2020.h
index fd9599a27c94b2b4e9797887171a4dfedaa687ca..7286b48d326cd8e02a6c7541a263a8259b59b74a 100644
--- a/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoRich2020.h
+++ b/fles/mcbm2018/unpacker/CbmMcbm2018UnpackerAlgoRich2020.h
@@ -14,6 +14,7 @@
 #include "CbmStar2019Algo.h"  // mother class
 
 // STD
+#include <array>
 #include <map>
 #include <vector>