diff --git a/analyze.rb b/analyze.rb
index 6d0150e..e545c66 100644
--- a/analyze.rb
+++ b/analyze.rb
@@ -101,7 +101,7 @@ series.each do |series, files|
     edges << { :from => data[file2][:id], :to => data[file1][:id] }
   end
 end
-edges.uniq
+edges.uniq!
 # edges.filter! { |e| e[:from] < e[:to] }
 
 puts ("export const nodes = " + JSON.pretty_unparse(data.values) + ";")