diff --git a/ext/chipmunk/extconf.rb b/ext/chipmunk/extconf.rb
index 8296a01..fac13ff 100644
--- a/ext/chipmunk/extconf.rb
+++ b/ext/chipmunk/extconf.rb
@@ -1,4 +1,4 @@
 require 'mkmf'
 $CFLAGS += ' -std=c99 -ffast-math -DNDEBUG '
-create_makefile('chipmunk/chipmunk')
+create_makefile('chipmunk')