diff --git a/sdn.cpp b/sdn.cpp
index 336e2e2..30cdb83 100644
--- a/sdn.cpp
+++ b/sdn.cpp
@@ -42,6 +42,7 @@
 #include <grp.h>
 #include <libgen.h>
 #include <time.h>
+#include <signal.h>
 
 #include <sys/inotify.h>
 #include <sys/xattr.h>