diff --git a/src/branch2.hpp b/src/branch2.hpp
index d284d935..66da4bee 100644
--- a/src/branch2.hpp
+++ b/src/branch2.hpp
@@ -1,3 +1,5 @@
+#include <stdint.h>
+
 class Branch2
 {
 public:
@@ -11,4 +13,5 @@ public:
 public:
   bool enabled;
   Mode mode;
+  uint64_t min_free_space;
 };