diff --git a/apple/internal/transition_support.bzl b/apple/internal/transition_support.bzl
index 7da7ade32e..0e98ef02fb 100644
--- a/apple/internal/transition_support.bzl
+++ b/apple/internal/transition_support.bzl
@@ -103,7 +103,7 @@ def _cpu_string(*, cpu, platform_type, settings = {}):
         return "ios_x86_64"
     if platform_type == "macos":
         host_cpu = settings["//command_line_option:host_cpu"]
-        if host_cpu == "darwin": 
+        if host_cpu == "darwin":
             return "darwin"
         if cpu:
             return "darwin_{}".format(cpu)