diff --git a/lib/brakeman/processors/lib/processor_helper.rb b/lib/brakeman/processors/lib/processor_helper.rb
index 5cc73f1c8243ab33aa1f057cc4a888e9fa78361d..0cd12817bd450fb78e3adf0316e967cf956331e1 100644
--- a/lib/brakeman/processors/lib/processor_helper.rb
+++ b/lib/brakeman/processors/lib/processor_helper.rb
@@ -8,9 +8,11 @@ module Brakeman::ProcessorHelper
   end
 
   def process_all! exp
-    exp.each_with_index do |e, i|
+    exp.map! do |e|
       if sexp? e
-        exp[i] = process e
+        process e
+      else
+        e
       end
     end