diff --git a/lib/frederick_api/v2/resource.rb b/lib/frederick_api/v2/resource.rb
index 9bb7d16..1340719 100644
--- a/lib/frederick_api/v2/resource.rb
+++ b/lib/frederick_api/v2/resource.rb
@@ -21,7 +21,7 @@ def self.all_records
       end
 
       def self.top_level_namespace
-        self.to_s.split('::').first.constantize
+        @top_level_namespace ||= self.to_s.split('::').first.constantize
       end
 
       def self.site
diff --git a/lib/frederick_api/version.rb b/lib/frederick_api/version.rb
index 75c5470..d072d21 100644
--- a/lib/frederick_api/version.rb
+++ b/lib/frederick_api/version.rb
@@ -2,5 +2,5 @@
 
 module FrederickAPI
   # Current gem version
-  VERSION = '0.1.6'
+  VERSION = '0.1.7'
 end