diff --git a/include/external/clara.h b/include/external/clara.h
index dba26a95..ce2ef2ec 100644
--- a/include/external/clara.h
+++ b/include/external/clara.h
@@ -620,7 +620,7 @@ namespace Clara {
             m_throwOnUnrecognisedTokens( other.m_throwOnUnrecognisedTokens )
         {
             if( other.m_floatingArg.get() )
-                m_floatingArg = ArgAutoPtr( new Arg( *other.m_floatingArg ) );
+                m_floatingArg.reset( new Arg( *other.m_floatingArg ) );
         }
 
         CommandLine& setThrowOnUnrecognisedTokens( bool shouldThrow = true ) {
@@ -649,7 +649,7 @@ namespace Clara {
         ArgBuilder operator[]( UnpositionalTag ) {
             if( m_floatingArg.get() )
                 throw std::logic_error( "Only one unpositional argument can be added" );
-            m_floatingArg = ArgAutoPtr( new Arg() );
+            m_floatingArg.reset( new Arg() );
             ArgBuilder builder( m_floatingArg.get() );
             return builder;
         }