diff --git a/aucat/conf.h b/aucat/conf.h
index 26f39ee..0fd9577 100644
--- a/aucat/conf.h
+++ b/aucat/conf.h
@@ -18,6 +18,8 @@
 #define CONF_H
 
 #ifdef DEBUG
+#include <signal.h>
+
 /*
  * Debug trace levels:
  *