diff --git a/python/requirements.txt b/python/requirements.txt
index f580cfb8cce..7e035a3d5bf 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -9,6 +9,9 @@ mozlog == 3.6
 setuptools == 18.5
 toml == 0.9.2
 
+# For pycparser 2.19 release bustage
+pycparser == 2.18
+
 # For Python linting
 flake8 == 2.4.1
 pep8 == 1.5.7