diff --git a/BUILD.bazel b/BUILD.bazel
index c57158d132e5..bbd22c58e039 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -1099,6 +1099,10 @@ cc_binary_with_abi(
 cc_binary_with_abi(
     name = "kselftest_rtc_rtctest",
     srcs = ["tools/testing/selftests/rtc/rtctest.c"],
+    copts = select({
+        ":arm": ["-mcpu=cortex-a8"],
+        "//conditions:default": [],
+    }),
     path_prefix = _KSELFTEST_DIR,
     target_compatible_with = ["@platforms//os:android"],
     visibility = ["//visibility:private"],