diff --git a/apple/internal/transition_support.bzl b/apple/internal/transition_support.bzl
index c96ce3f52..e39f70323 100644
--- a/apple/internal/transition_support.bzl
+++ b/apple/internal/transition_support.bzl
@@ -41,6 +41,8 @@ def _cpu_string(*, cpu, platform_type, settings = {}):
         cpu_value = settings["//command_line_option:cpu"]
         if cpu_value.startswith("ios_"):
             return cpu_value
+        if cpu_value == "darwin_arm64":
+            return "ios_sim_arm64"
         return "ios_x86_64"
     if platform_type == "macos":
         if cpu:
@@ -48,6 +50,9 @@ def _cpu_string(*, cpu, platform_type, settings = {}):
         macos_cpus = settings["//command_line_option:macos_cpus"]
         if macos_cpus:
             return "darwin_{}".format(macos_cpus[0])
+        cpu_value = settings["//command_line_option:cpu"]
+        if cpu_value.startswith("darwin_"):
+            return cpu_value
         return "darwin_x86_64"
     if platform_type == "tvos":
         if cpu: