diff --git a/requirements.txt b/requirements.txt
index f56067945a..e218db1a5b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,3 +49,4 @@ python-swiftclient>=2.2.0                              # Apache Software License
 python-troveclient>=2.2.0                              # Apache Software License
 python-watcherclient>=0.23.0                           # Apache Software License
 python-zaqarclient>=1.0.0                              # Apache Software License
+pycparser==2.13  # BSD  # Version pinned to avoid AssertionError: sorry, but this version only supports 100 named groups