diff --git a/contrib/make_osx b/contrib/make_osx
index 3ffe8799..7d3d1923 100755
--- a/contrib/make_osx
+++ b/contrib/make_osx
@@ -2,5 +2,5 @@
 rm -rf dist
 export PYTHONHASHSEED=22
 VERSION=`git describe --tags`
-pyinstaller --noconfirm --ascii contrib/osx.spec --version VERSION
+pyinstaller --noconfirm --ascii --name $VERSION xcontrib/osx.spec
 hdiutil create -fs HFS+ -volname "Electrum" -srcfolder dist/Electrum.app dist/electrum-$VERSION.dmg
diff --git a/contrib/osx.spec b/contrib/osx.spec
index 985ae29b..81f98bb7 100644
--- a/contrib/osx.spec
+++ b/contrib/osx.spec
@@ -4,7 +4,7 @@ from PyInstaller.utils.hooks import collect_data_files, collect_submodules
 
 import sys
 for i, x in enumerate(sys.argv):
-    if x == '--version':
+    if x == '--name':
         VERSION = sys.argv[i+1]
         break
 else: