diff --git a/include/types/fd.h b/include/types/fd.h
index 1684537..5336461 100644
--- a/include/types/fd.h
+++ b/include/types/fd.h
@@ -24,6 +24,7 @@
 
 #include <common/config.h>
 #include <common/hathreads.h>
+#include <common/ist.h>
 #include <types/port_range.h>
 
 /* Direction for each FD event update */