diff --git a/tests/requirements/base.txt b/tests/requirements/base.txt
index 2cb272ff15..374b836fad 100644
--- a/tests/requirements/base.txt
+++ b/tests/requirements/base.txt
@@ -6,6 +6,8 @@ jinja2 >= 2.7
 numpy
 Pillow
 PyYAML
+# pylibmc/libmemcached can't be built on Windows.
+pylibmc; sys.platform != 'win32'
 pytz > dev
 selenium
 sqlparse