diff --git a/common/lib/calc/setup.py b/common/lib/calc/setup.py
index d62dd9b6eb..9354bb7b83 100644
--- a/common/lib/calc/setup.py
+++ b/common/lib/calc/setup.py
@@ -5,7 +5,7 @@ setup(
     version="0.2",
     packages=["calc"],
     install_requires=[
-        "pyparsing==2.2.0",
+        "pyparsing==2.0.7",
         "numpy==1.6.2",
         "scipy==0.14.0",
     ],