diff --git a/tests/pidfile_func.c b/tests/pidfile_func.c
index e13eb1b..bd63b12 100644
--- a/tests/pidfile_func.c
+++ b/tests/pidfile_func.c
@@ -1,6 +1,8 @@
 #include <paths.h>
+#include <signal.h>
 #include <stdarg.h>
 #include <time.h>
+
 #include "check.h"
 
 extern char *__progname;