diff --git a/cibuildwheel/__main__.py b/cibuildwheel/__main__.py
index cf15f57c..b8eeebd6 100644
--- a/cibuildwheel/__main__.py
+++ b/cibuildwheel/__main__.py
@@ -136,6 +136,7 @@ def print_preamble(platform, build_options):
         print('  %s: %r' % (option, value))
 
     print('\nHere we go!\n')
+    sys.stdout.flush()
 
 if __name__ == '__main__':
     main()