diff --git a/lib/liquid/block_body.rb b/lib/liquid/block_body.rb
index c543d822..45be8b8a 100644
--- a/lib/liquid/block_body.rb
+++ b/lib/liquid/block_body.rb
@@ -170,7 +170,7 @@ module Liquid
 
     def disable_tags(context, tags, &block)
       return yield if tags.empty?
-      context.registers['disabled_tags'].disable(tags, &block)
+      context.registers[:disabled_tags].disable(tags, &block)
     end
 
     def raise_if_resource_limits_reached(context, length)
diff --git a/lib/liquid/registers/disabled_tags.rb b/lib/liquid/registers/disabled_tags.rb
index 79b64727..b1cd3bda 100644
--- a/lib/liquid/registers/disabled_tags.rb
+++ b/lib/liquid/registers/disabled_tags.rb
@@ -28,5 +28,5 @@ module Liquid
     end
   end
 
-  Template.add_register('disabled_tags', DisabledTags.new)
+  Template.add_register(:disabled_tags, DisabledTags.new)
 end
diff --git a/lib/liquid/tag.rb b/lib/liquid/tag.rb
index 832e32c7..ffd22868 100644
--- a/lib/liquid/tag.rb
+++ b/lib/liquid/tag.rb
@@ -47,7 +47,7 @@ module Liquid
     end
 
     def disabled?(context)
-      context.registers['disabled_tags'].disabled?(tag_name)
+      context.registers[:disabled_tags].disabled?(tag_name)
     end
 
     def disabled_error_message
diff --git a/lib/liquid/template.rb b/lib/liquid/template.rb
index 2f0bed4b..e23df246 100644
--- a/lib/liquid/template.rb
+++ b/lib/liquid/template.rb
@@ -93,7 +93,7 @@ module Liquid
       end
 
       def add_register(name, klass)
-        registers[name.to_s] = klass
+        registers[name.to_sym] = klass
       end
 
       def registers