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-rw-r--r--boost/units/io.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/boost/units/io.hpp b/boost/units/io.hpp
index 577635d0ee..338a919ea6 100644
--- a/boost/units/io.hpp
+++ b/boost/units/io.hpp
@@ -41,7 +41,7 @@ namespace serialization {
/// Boost Serialization library support for units.
template<class Archive,class System,class Dim>
-inline void serialize(Archive& ar,boost::units::unit<Dim,System>&,const unsigned int /*version*/)
+inline void serialize(Archive& /*ar*/,boost::units::unit<Dim,System>&,const unsigned int /*version*/)
{ }
/// Boost Serialization library support for quantities.