diff --git a/test-requirements.txt b/test-requirements.txt
index 1cb1476..28342a5 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,3 +10,4 @@ sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
+pyflakes>=2.2.0