diff --git a/app/models/code.rb b/app/models/code.rb
index 7d05a9c..f0bdb42 100644
--- a/app/models/code.rb
+++ b/app/models/code.rb
@@ -19,7 +19,7 @@ class Code
 
   # Given a context, generates a hash with each unique Codes as a key and the counts of its uses as a value.
   def self.histogram(context)
-    codes = where(context: context).query_as(:c).with('c, count{(c)-[:EXPERIENCES]-()} AS ct').where('ct > 0').order('c DESC').return('c.name, ct')
+    codes = where(context: context).query_as(:c).with('c, count{(c)-[:EXPERIENCES]-(:Persona)} AS ct').where('ct > 0').order('c DESC').return('c.name, ct')
     codes.inject({}) {|accumulator,code| accumulator[code.values[0]] ||= 0; accumulator[code.values[0]] += code.values[1]; accumulator}
   end