diff --git a/letsencrypt-auto-source/letsencrypt-auto b/letsencrypt-auto-source/letsencrypt-auto
index 89072ec88..f3525aaee 100755
--- a/letsencrypt-auto-source/letsencrypt-auto
+++ b/letsencrypt-auto-source/letsencrypt-auto
@@ -1089,7 +1089,7 @@ cryptography==2.0.2 \
     --hash=sha256:01e6e60654df64cca53733cda39446d67100c819c181d403afb120e0d2a71e1b \
     --hash=sha256:d46f4e5d455cb5563685c52ef212696f0a6cc1ea627603218eabbd8a095291d8 \
     --hash=sha256:3780b2663ee7ebb37cb83263326e3cd7f8b2ea439c448539d4b87de12c8d06ab
-enum34==1.1.2 \
+enum34==1.1.2 ; python_version < '3.4' \
     --hash=sha256:2475d7fcddf5951e92ff546972758802de5260bf409319a9f1934e6bbc8b1dc7 \
     --hash=sha256:35907defb0f992b75ab7788f65fedc1cf20ffa22688e0e6f6f12afc06b3ea501
 funcsigs==1.0.2 \
diff --git a/letsencrypt-auto-source/pieces/dependency-requirements.txt b/letsencrypt-auto-source/pieces/dependency-requirements.txt
index 0e2cec984..1e69af9c2 100644
--- a/letsencrypt-auto-source/pieces/dependency-requirements.txt
+++ b/letsencrypt-auto-source/pieces/dependency-requirements.txt
@@ -93,7 +93,7 @@ cryptography==2.0.2 \
     --hash=sha256:01e6e60654df64cca53733cda39446d67100c819c181d403afb120e0d2a71e1b \
     --hash=sha256:d46f4e5d455cb5563685c52ef212696f0a6cc1ea627603218eabbd8a095291d8 \
     --hash=sha256:3780b2663ee7ebb37cb83263326e3cd7f8b2ea439c448539d4b87de12c8d06ab
-enum34==1.1.2 \
+enum34==1.1.2 ; python_version < '3.4' \
     --hash=sha256:2475d7fcddf5951e92ff546972758802de5260bf409319a9f1934e6bbc8b1dc7 \
     --hash=sha256:35907defb0f992b75ab7788f65fedc1cf20ffa22688e0e6f6f12afc06b3ea501
 funcsigs==1.0.2 \