diff --git a/requirements.txt b/requirements.txt
index d7174f103..0f0223dab 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
 # https://github.com/bw2/ConfigArgParse/issues/17
--e git+https://github.com/kuba/ConfigArgParse.git#egg=ConfigArgParse
+-e git+https://github.com/kuba/ConfigArgParse.git@python2.6#egg=ConfigArgParse
 -e .