diff --git a/src/branch2.hpp b/src/branch2.hpp
index 66da4bee..a5f04cc8 100644
--- a/src/branch2.hpp
+++ b/src/branch2.hpp
@@ -1,3 +1,5 @@
+#include "filesystem.hpp"
+
 #include <stdint.h>
 
 class Branch2