diff --git a/requirements.txt b/requirements.txt
index 3494543..02959bf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-enum34==1.1.6 # backported py34 stdlib enum for py27-33
+enum34==1.1.6; python_version < '3.4'  # backported py34 stdlib enum for py27-33
 voluptuous==0.11.1