diff --git a/src/name-assignment/assignment-hash.cpp b/src/name-assignment/assignment-hash.cpp
index 0dec488..f292821 100644
--- a/src/name-assignment/assignment-hash.cpp
+++ b/src/name-assignment/assignment-hash.cpp
@@ -31,7 +31,7 @@
 {}
 
 std::vector<PartialName>
-AssignmentHash::assignName(const std::multimap<std::string, std::string> &params)
+AssignmentHash::assignName(const std::multimap<std::string, std::string>& params)
 {
   std::vector<PartialName> resultList;
   Name result;