diff --git a/server/thread.c b/server/thread.c
index 55eb8513af8..071c91988b6 100644
--- a/server/thread.c
+++ b/server/thread.c
@@ -33,6 +33,8 @@
 #include <time.h>
 #include <poll.h>
 #ifdef HAVE_SCHED_H
+/* FreeBSD needs this for cpu_set_t intead of its cpuset_t */
+#define _WITH_CPU_SET_T
 #include <sched.h>
 #endif