diff --git a/ndn-cpp/common.cpp b/ndn-cpp/common.cpp
index b4c6e45..b4a1bd8 100644
--- a/ndn-cpp/common.cpp
+++ b/ndn-cpp/common.cpp
@@ -10,7 +10,7 @@
 
 namespace ndn {
 
-string toHex(const vector<unsigned char> &array) 
+string toHex(const vector<unsigned char>& array) 
 {
   ostringstream result;
   result.flags(ios::hex | ios::uppercase);