diff --git a/lib/pry/history_array.rb b/lib/pry/history_array.rb
index 9f2635bc..60e41bca 100644
--- a/lib/pry/history_array.rb
+++ b/lib/pry/history_array.rb
@@ -91,7 +91,7 @@ class Pry
 
     # Returns [Hash] copy of the internal @hash history
     def to_h
-      Marshal.load( Marshal.dump(@hash) )
+      @hash.dup
     end
 
     def pop!