diff --git a/src/kick.h b/src/kick.h
index 0e28e271aad04e9b16a4e988112aa95b36cb4f20..82560f77ac514f0b76d77e66e5787039380bb40e 100644
--- a/src/kick.h
+++ b/src/kick.h
@@ -24,6 +24,7 @@
 
 /* Local headers. */
 #include "const.h"
+#include "black_holes.h"
 #include "debug.h"
 #include "stars.h"
 #include "timeline.h"