diff --git a/cibuildwheel/macos.py b/cibuildwheel/macos.py
index 74e072b1..d9723e8b 100644
--- a/cibuildwheel/macos.py
+++ b/cibuildwheel/macos.py
@@ -52,7 +52,7 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
 
     # get latest pip once and for all
     
-    call(['curl', '-L', '-o', '--retry', '3', '--retry-delay', '3', get_pip_script, get_pip_url])
+    call(['curl', '-L', '--retry', '3', '--retry-delay', '3', '-o', get_pip_script, get_pip_url])
 
     for config in python_configurations:
         # if this version of python isn't installed, get it from python.org and install