diff --git a/mission/acsDefs.h b/mission/acsDefs.h
index ab182112..d17351a6 100644
--- a/mission/acsDefs.h
+++ b/mission/acsDefs.h
@@ -1,6 +1,7 @@
 #ifndef MISSION_ACSDEFS_H_
 #define MISSION_ACSDEFS_H_
 
+#include <eive/eventSubsystemIds.h>
 #include <fsfw/modes/HasModesIF.h>
 
 namespace acs {