diff --git a/src/name-assignment/assignment-hash.hpp b/src/name-assignment/assignment-hash.hpp
index 941ce5a..77e5e91 100644
--- a/src/name-assignment/assignment-hash.hpp
+++ b/src/name-assignment/assignment-hash.hpp
@@ -29,7 +29,7 @@
 /**
  * assign names base on client probe parameter
  */
-class AssignmentHash: public NameAssignmentFunc
+class AssignmentHash : public NameAssignmentFunc
 {
 public:
   AssignmentHash(const std::string& format = "");