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-rw-r--r--boost/icl/concept/element_associator.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/boost/icl/concept/element_associator.hpp b/boost/icl/concept/element_associator.hpp
index a9371848d1..ce421e018c 100644
--- a/boost/icl/concept/element_associator.hpp
+++ b/boost/icl/concept/element_associator.hpp
@@ -188,7 +188,7 @@ operator + (const typename Type::value_type& operand, Type object)
}
template <class Type>
-inline typename enable_if<is_associative_element_container<Type>, Type>::type
+inline typename enable_if<is_associative_element_container<Type>, Type>::type&
operator += (Type& object, const Type& operand)
{
if(&object == &operand)