diff --git a/pt.c b/pt.c
index 72af4c1054e..0e68c6bbef1 100644
--- a/pt.c
+++ b/pt.c
@@ -22,6 +22,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
+#include <sched.h>
 #include <stdio.h>
 
 #include "lib/dbg/profiling.h"