diff --git a/src/basic/exit-status.c b/src/basic/exit-status.c
index c09efdd2cb..5ab36825c0 100644
--- a/src/basic/exit-status.c
+++ b/src/basic/exit-status.c
@@ -20,6 +20,7 @@
 ***/
 
 #include <stdlib.h>
+#include <signal.h>
 
 #include "exit-status.h"
 #include "set.h"