diff --git a/cc/toolchains/impl/toolchain_config.bzl b/cc/toolchains/impl/toolchain_config.bzl
index 1f6efefe5..863bb4a70 100644
--- a/cc/toolchains/impl/toolchain_config.bzl
+++ b/cc/toolchains/impl/toolchain_config.bzl
@@ -84,9 +84,9 @@ def _cc_toolchain_config_impl(ctx):
             # compiler
             compiler = ctx.attr.compiler,
             target_cpu = ctx.attr.cpu,
+            target_libc = ctx.attr.target_libc,  # Used by legacy features to determine if we're building for Apple platfroms or not
             # These fields are only relevant for legacy toolchain resolution.
             target_system_name = "",
-            target_libc = "",
             abi_version = "",
             abi_libc_version = "",
         ),
@@ -105,6 +105,7 @@ cc_toolchain_config = rule(
         # Attributes new to this rule.
         "compiler": attr.string(default = ""),
         "cpu": attr.string(default = ""),
+        "target_libc": attr.string(default = ""),
         "tool_map": attr.label(providers = [ToolConfigInfo], mandatory = True),
         "args": attr.label_list(providers = [ArgsListInfo]),
         "known_features": attr.label_list(providers = [FeatureSetInfo]),
diff --git a/cc/toolchains/toolchain.bzl b/cc/toolchains/toolchain.bzl
index fa41163ab..c0b712426 100644
--- a/cc/toolchains/toolchain.bzl
+++ b/cc/toolchains/toolchain.bzl
@@ -186,6 +186,10 @@ def cc_toolchain(
             Label("//cc/toolchains/impl:windows_x86_64"): "win64",
             "//conditions:default": "",
         }),
+        target_libc = select({
+            Label("//cc/toolchains/platforms:apple"): "macosx",
+            "//conditions:default": "",
+        }),
         visibility = ["//visibility:private"],
         **kwargs
     )