diff --git a/src/cmd/9term/SunOS.c b/src/cmd/9term/SunOS.c
index 97cae2dc..467f0d23 100644
--- a/src/cmd/9term/SunOS.c
+++ b/src/cmd/9term/SunOS.c
@@ -1,6 +1,7 @@
 #include <u.h>
 #include <termios.h>
 #include <stropts.h>
+#include <signal.h>
 #include <libc.h>
 #include "term.h"