diff --git a/sysdeps/mach/hurd/setsid.c b/sysdeps/mach/hurd/setsid.c
index a1ad433b31..6653b81164 100644
--- a/sysdeps/mach/hurd/setsid.c
+++ b/sysdeps/mach/hurd/setsid.c
@@ -20,6 +20,7 @@
 #include <unistd.h>
 #include <hurd.h>
 #include <hurd/port.h>
+#include <hurd/fd.h>
 
 /* Create a new session with the calling process as its leader.
    The process group IDs of the session and the calling process