diff --git a/extconf.rb b/ext/extconf.rb
similarity index 93%
rename from extconf.rb
rename to ext/extconf.rb
index 9ee2a39..6698b9e 100644
--- a/extconf.rb
+++ b/ext/extconf.rb
@@ -6,7 +6,7 @@ dir_config('mysql')
 have_header('mysql/mysql.h')
 
 $CFLAGS << ' -Wall -Wextra -funroll-loops'
-# $CFLAGS << ' -O0 -ggdb'
+$CFLAGS << ' -O0 -ggdb3'
 
 if have_library('mysqlclient')
   if RUBY_VERSION =~ /1.9/
diff --git a/mysql_duce_ext.c b/ext/mysql_duce_ext.c
similarity index 100%
rename from mysql_duce_ext.c
rename to ext/mysql_duce_ext.c
diff --git a/mysql_duce_ext.h b/ext/mysql_duce_ext.h
similarity index 100%
rename from mysql_duce_ext.h
rename to ext/mysql_duce_ext.h