diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 9e66335..1f3d2fe 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -5,6 +5,7 @@ build_targets: &build_targets
   - "//examples/..."
   - "//tests/..."
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
+  - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
 test_targets: &test_targets
   - "//:all"
   - "//cc/..."
@@ -20,6 +21,7 @@ build_targets_bazel_6: &build_targets_bazel_6
   - "-//examples/custom_toolchain:legacy_selector" # Example only works on Linux
   - "-//tests/rule_based_toolchain/..." # proto.encode_text doesn't support None
   - "-//cc:optional_current_cc_toolchain" # Not supported in Bazel 6
+  - "-//tests/rule_based_toolchain/tool_map:_duplicate_tool_test_subject" # Intentionally broken rule.
 test_targets_bazel_6: &test_targets_bazel_6
   - "//:all"
   - "//cc:all"