diff --git a/src/lxc/attach.c b/src/lxc/attach.c
index 3e9fb5f68..99b9c8917 100644
--- a/src/lxc/attach.c
+++ b/src/lxc/attach.c
@@ -31,6 +31,7 @@
 #include <sys/param.h>
 #include <sys/prctl.h>
 #include <sys/mount.h>
+#include <sys/socket.h>
 #include <sys/syscall.h>
 #include <sys/wait.h>
 #include <linux/unistd.h>