diff --git a/lib/props_template/base.rb b/lib/props_template/base.rb
index 273b83f..9380f4d 100644
--- a/lib/props_template/base.rb
+++ b/lib/props_template/base.rb
@@ -36,7 +36,7 @@ def handle_set_block(key, options)
     end
 
     def format_key(key)
-      key.to_s
+      (::Symbol === key) ? key.name : key.to_s
     end
 
     def set!(key, value = nil)
diff --git a/lib/props_template/base_with_extensions.rb b/lib/props_template/base_with_extensions.rb
index 94828d7..2a7d1d8 100644
--- a/lib/props_template/base_with_extensions.rb
+++ b/lib/props_template/base_with_extensions.rb
@@ -46,10 +46,6 @@ def scoped_state
       @em = ExtensionManager.new(self, prev_state[1], prev_state[2])
     end
 
-    def format_key(key)
-      key.to_s
-    end
-
     def set!(key, options = {}, &block)
       if !block && options.is_a?(Props::Options)
         options.valid_for_set!