diff --git a/ext/c/extconf.rb b/ext/c/extconf.rb
index 469c1a8..a482b69 100644
--- a/ext/c/extconf.rb
+++ b/ext/c/extconf.rb
@@ -5,9 +5,9 @@ have_header('ruby.h')
 $CFLAGS << ' -Wextra -Wall -pedantic'
 
 if ENV['DEBUG']
-  $CFLAGS << ' -O0'
+  $CFLAGS << ' -O0 -g'
 else
-  $CFLAGS << ' -O3 -g'
+  $CFLAGS << ' -O3'
 end
 
 create_makefile('liboga/liboga')