diff --git a/src/branch_tier.hpp b/src/branch_tier.hpp
index 30af930a..76097557 100644
--- a/src/branch_tier.hpp
+++ b/src/branch_tier.hpp
@@ -20,7 +20,7 @@ public:
   std::vector<Branch2>::iterator end() { return _branches.end(); }
   std::vector<Branch2>::const_iterator begin() const { return _branches.begin(); }
   std::vector<Branch2>::const_iterator end() const { return _branches.end(); }
-  
+
 
 private:
   std::vector<Branch2>  _branches;