diff --git a/python_runner.sh b/python_runner.sh
index 51a5445d7f..dc2c157185 100755
--- a/python_runner.sh
+++ b/python_runner.sh
@@ -12,7 +12,7 @@
 ## ./git-foo-command  #=> runs `python git_foo_command.py`
 
 ## Constants
-PYTHONDONTWRITEBYTECODE=1
+PYTHONDONTWRITEBYTECODE=1; export PYTHONDONTWRITEBYTECODE
 
 ## "Input parameters".
 # If set before the script is sourced, then we'll use the pre-set values.