diff --git a/dev_requirements.txt b/dev_requirements.txt
index 68f0422a..972dbcb3 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -5,6 +5,7 @@ Django==1.6.11  # Last version supporting 2.6.
 mock==2.0.0
 pytz==2018.5
 paramiko==2.3.2  # Last 2.6-compat version.
+pycparser==2.18  # Last version supporting 2.6.
 pytest-catchlog==1.2.2
 pytest==3.1.2
 PyYAML==3.11; python_version < '2.7'