diff --git a/ext/liboga/lexer.rl b/ext/liboga/lexer.rl
index fe62911..bd04c06 100644
--- a/ext/liboga/lexer.rl
+++ b/ext/liboga/lexer.rl
@@ -128,7 +128,7 @@ VALUE oga_xml_lexer_advance(VALUE self)
     doctype_start = '<!DOCTYPE'i whitespace+;
 
     action start_doctype {
-        liboga_xml_lexer_callback_simple(self, "on_start_doctype");
+        liboga_xml_lexer_callback_simple(self, "on_doctype_start");
         fcall doctype;
     }
 
diff --git a/lib/oga/xml/lexer.rb b/lib/oga/xml/lexer.rb
index b90b3d4..78daf6b 100644
--- a/lib/oga/xml/lexer.rb
+++ b/lib/oga/xml/lexer.rb
@@ -165,7 +165,7 @@ module Oga
       ##
       # Called when a doctype starts.
       #
-      def on_start_doctype
+      def on_doctype_start
         add_token(:T_DOCTYPE_START)
       end