diff --git a/src/sexpots/sexpots.c b/src/sexpots/sexpots.c
index 4e4f9399fb6af274ead7dacbab776bce55209f46..8978700a031a3b20c6367060441a69091d2f4a63 100644
--- a/src/sexpots/sexpots.c
+++ b/src/sexpots/sexpots.c
@@ -22,6 +22,9 @@
 /* ANSI C */
 #include <stdarg.h>
 #include <stdio.h>
+#if defined(__unix__)
+#include <signal.h>
+#endif
 
 /* xpdev lib */
 #include "dirwrap.h"