diff --git a/fdm.c b/fdm.c
index 746a6d59..d35db6a9 100644
--- a/fdm.c
+++ b/fdm.c
@@ -8,6 +8,7 @@
 #include <fcntl.h>
 
 #include <sys/epoll.h>
+#include <sys/timerfd.h>
 
 #include <tllist.h>