diff --git a/pre_commit/languages/swift.py b/pre_commit/languages/swift.py
index 8250ab70..f16bb045 100644
--- a/pre_commit/languages/swift.py
+++ b/pre_commit/languages/swift.py
@@ -44,7 +44,7 @@ def install_environment(
     os.mkdir(envdir)
     cmd_output_b(
         'swift', 'build',
-        '-C', prefix.prefix_dir,
+        '--package-path', prefix.prefix_dir,
         '-c', BUILD_CONFIG,
         '--build-path', os.path.join(envdir, BUILD_DIR),
     )