diff --git a/ps.c b/ps.c
index 7afb009..9e96a54 100644
--- a/ps.c
+++ b/ps.c
@@ -36,6 +36,7 @@
 #include <fcntl.h>
 #include <ctype.h>
 #include <string.h>
+#include <termios.h>
 #include <sys/ioctl.h>
 #include "busybox.h"