diff --git a/ion/src/blackbox/boot.cpp b/ion/src/blackbox/boot.cpp
index 6a0084c22..2de302982 100644
--- a/ion/src/blackbox/boot.cpp
+++ b/ion/src/blackbox/boot.cpp
@@ -1,5 +1,6 @@
 #include <ion.h>
 #include <stdlib.h>
+#include <signal.h>
 #include "events.h"
 #include "display.h"