diff --git a/lib/fugit/duration.rb b/lib/fugit/duration.rb
index 62841fa..4c4d1b6 100644
--- a/lib/fugit/duration.rb
+++ b/lib/fugit/duration.rb
@@ -217,7 +217,7 @@ def opposite
     def add_numeric(n)
 
       h = @h.dup
-      h[:sec] = (h[:sec] || 0) + n.to_i
+      h[:sec] = (h[:sec] || 0) + n
 
       self.class.allocate.init(nil,{}, h)
     end