diff --git a/include/boost/filesystem/v3/convenience.hpp b/include/boost/filesystem/v3/convenience.hpp
index 18ff2b0..be9934a 100644
--- a/include/boost/filesystem/v3/convenience.hpp
+++ b/include/boost/filesystem/v3/convenience.hpp
@@ -25,17 +25,17 @@ namespace boost
 
 # ifndef BOOST_FILESYSTEM_NO_DEPRECATED
 
-    std::string extension(const path & p)
+    inline std::string extension(const path & p)
     {
       return p.extension().string();
     }
 
-    std::string basename(const path & p)
+    inline std::string basename(const path & p)
     {
       return p.stem().string();
     }
 
-    path change_extension( const path & p, const path & new_extension )
+    inline path change_extension( const path & p, const path & new_extension )
     { 
       path new_p( p );
       new_p.replace_extension( new_extension );