diff --git a/trunk/ripnews/set/intspan.rb b/trunk/ripnews/set/intspan.rb
index bbcd3b7..3f45571 100644
--- a/trunk/ripnews/set/intspan.rb
+++ b/trunk/ripnews/set/intspan.rb
@@ -257,7 +257,7 @@ def elements
 	end
 
 	elements = []
-	edges = @set["edges"]
+	edges = @set["edges"].dup
 	while (edges.length>0)
 		lower, upper = edges.slice!(0..1)
 		elements += (lower+1 .. upper).to_a