diff --git a/toCOPY/builder-constraints.txt b/toCOPY/builder-constraints.txt
index 04c829e9..bfa07909 100644
--- a/toCOPY/builder-constraints.txt
+++ b/toCOPY/builder-constraints.txt
@@ -1,2 +1,2 @@
 more-itertools===5.0.0;python_version=='2.7' # Last version with official 2.7 support
-
+pyparsing===2.4.7;python_version=='2.7'