diff --git a/sched/pthread/pthread_kill.c b/sched/pthread/pthread_kill.c
index 21b18f8a52..1c2663e47e 100644
--- a/sched/pthread/pthread_kill.c
+++ b/sched/pthread/pthread_kill.c
@@ -47,6 +47,7 @@
 #include <debug.h>
 
 #include <nuttx/sched.h>
+#include <nuttx/signal.h>
 
 #include "sched/sched.h"
 #include "signal/signal.h"