diff --git a/packaging/MacOS/make-app.sh b/packaging/MacOS/make-app.sh
index 806495c674..7805241c73 100755
--- a/packaging/MacOS/make-app.sh
+++ b/packaging/MacOS/make-app.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-PYTHON="python3"
+export PYTHON="python3"
 PYTHON_MAJOR_VERSION=`$PYTHON -c 'import sys;sys.stdout.write("%s" % sys.version_info[0])'`
 PYTHON_MINOR_VERSION=`$PYTHON -c 'import sys;sys.stdout.write("%s" % sys.version_info[1])'`