diff --git a/test-requirements.txt b/test-requirements.txt
index cc52d44894..bc17d0df17 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -18,7 +18,7 @@ openstackdocstheme>=1.5.0 # Apache-2.0
 # Do not remove 'PyMySQL' and 'psycopg2' dependencies. They are used
 # by oslo_db lib for running MySQL and PostgreSQL DB migration tests.
 # See http://docs.openstack.org/developer/oslo.db/contributing.html#how-to-run-unit-tests
-PyMySQL>=0.6.2 # MIT License
+PyMySQL!=0.7.7,>=0.6.2 # MIT License
 psycopg2>=2.5 # LGPL/ZPL
 
 python-subunit>=0.0.18 # Apache-2.0/BSD