diff --git a/src/core/attribute-list.cc b/src/core/attribute-list.cc
index c32ad4d91..b9dde8bf2 100644
--- a/src/core/attribute-list.cc
+++ b/src/core/attribute-list.cc
@@ -187,10 +187,11 @@ std::string
 AttributeList::SerializeToString (void) const
 {
   std::ostringstream oss;
-  for (Attrs::const_iterator i = m_attributes.begin (); i != m_attributes.end (); i++)
+  for (Attrs::const_iterator i = m_attributes.begin (); i != m_attributes.end ();)
     {
       std::string name = LookupAttributeFullNameByChecker (i->checker);
       oss << name << "=" << i->value.SerializeToString (i->checker);
+      i++;
       if (i != m_attributes.end ())
         {
           oss << "|";