diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -32,6 +32,9 @@
 #ifndef _NETINET_TCP_VAR_H_
 #define _NETINET_TCP_VAR_H_
 
+#include <sys/_callout.h>
+#include <sys/osd.h>
+
 #include <netinet/tcp.h>
 #include <netinet/tcp_fsm.h>