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-rw-r--r--boost/units/units_fwd.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/boost/units/units_fwd.hpp b/boost/units/units_fwd.hpp
index e97c46eb02..cca5c0b15a 100644
--- a/boost/units/units_fwd.hpp
+++ b/boost/units/units_fwd.hpp
@@ -49,7 +49,7 @@ template<class T> struct is_unit;
template<class T,class Dim> struct is_unit_of_dimension;
template<class T,class System> struct is_unit_of_system;
-template<class Unit,class Y> class quantity;
+template<class Unit,class Y = double> class quantity;
template<class System,class Y> struct dimensionless_quantity;
template<class T> struct is_quantity;