diff --git a/src/init.c b/src/init.c
index 0408bdc..646aeb8 100644
--- a/src/init.c
+++ b/src/init.c
@@ -39,6 +39,9 @@
 #include <unistd.h>
 #include <errno.h>
 #include <stdlib.h>
+#if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#include <signal.h>
+#endif
 
 #define LINESZ 1024