diff --git a/osx.sh b/osx.sh
index 2f59f446..834a6243 100755
--- a/osx.sh
+++ b/osx.sh
@@ -14,7 +14,7 @@ fi
 
 echo "Creating OS X packages for Bitmessage."
 
-cd src && python build_osx.py py2app
+cd src && python2.7 build_osx.py py2app
 
 if [[ $? = "0" ]]; then
   hdiutil create -fs HFS+ -volname "Bitmessage" -srcfolder dist/Bitmessage.app dist/bitmessage-v$1.dmg