diff --git a/src/B0Tracker_geo.cpp b/src/B0Tracker_geo.cpp
index 58b4205c40a53a566d31a6fff454a10cbb558797..ac62313e437c3553f51860ce4b786a91106e25a7 100644
--- a/src/B0Tracker_geo.cpp
+++ b/src/B0Tracker_geo.cpp
@@ -5,6 +5,7 @@
 #include "DDRec/Surface.h"
 #include "XML/Layering.h"
 #include "XML/Utilities.h"
+#include <array>
 #include <map>
 
 #if defined(USE_ACTSDD4HEP)