diff --git a/app/models/category.rb b/app/models/category.rb
index a0a3138..59e8b84 100644
--- a/app/models/category.rb
+++ b/app/models/category.rb
@@ -18,7 +18,7 @@ class Category
 
   # Generates a hash with the unique category name as the key and the count of its associated codes as a value.
   def self.histogram(context)
-    categories = where(context: context).query_as(:c).with('c, count{(c)-[:CATEGORIZED_AS]-(code:Code)} AS ct').where('ct > 0').return("c.name, ct").order('ct DESC')
+    categories = where(context: context).query_as(:c).with('c, count{(c)-[:CATEGORIZED_AS]-(code:Code)} AS ct').return("c.name, ct").order('ct DESC')
     categories.inject({}) {|accumulator,category| accumulator[category.values[0]] ||= 0; accumulator[category.values[0]] += category.values[1]; accumulator}
   end
 
diff --git a/spec/models/category_spec.rb b/spec/models/category_spec.rb
index b777a9a..d2f5549 100644
--- a/spec/models/category_spec.rb
+++ b/spec/models/category_spec.rb
@@ -3,7 +3,7 @@
 RSpec.describe Category do
 
   before do
-    allow(Category).to receive_message_chain(:where, :query_as, :with, :where, :return, :order).and_return(response)
+    allow(Category).to receive_message_chain(:where, :query_as, :with, :return, :order).and_return(response)
   end
 
   let(:result_set) { Struct.new(:values) }