diff --git a/test/integration/targets/uri/files/constraints.txt b/test/integration/targets/uri/files/constraints.txt
index 309ba28c5c6..88234c427f8 100644
--- a/test/integration/targets/uri/files/constraints.txt
+++ b/test/integration/targets/uri/files/constraints.txt
@@ -1 +1,2 @@
 cryptography < 2.2 ; python_version < "2.7" # cryptography 2.2+ requires python 2.7+
+pyopenssl < 18.0 ; python_version < "2.7" # pyopenssl 18.0+ requires python 2.7+