diff --git a/rs/tests/consensus/subnet_recovery/BUILD.bazel b/rs/tests/consensus/subnet_recovery/BUILD.bazel
index 5a12bc3b179..f596b57741f 100644
--- a/rs/tests/consensus/subnet_recovery/BUILD.bazel
+++ b/rs/tests/consensus/subnet_recovery/BUILD.bazel
@@ -228,6 +228,7 @@ system_test_nns(
 
 system_test_nns(
     name = "sr_app_large_with_tecdsa_test",
+    extra_head_nns_tags = ["manual"],  # Let's not run this expensive test against the HEAD NNS canisters to save resources.
     flaky = True,
     proc_macro_deps = MACRO_DEPENDENCIES,
     tags = [
diff --git a/rs/tests/message_routing/xnet/BUILD.bazel b/rs/tests/message_routing/xnet/BUILD.bazel
index 2906a33bec7..7d376539ca4 100644
--- a/rs/tests/message_routing/xnet/BUILD.bazel
+++ b/rs/tests/message_routing/xnet/BUILD.bazel
@@ -8,6 +8,7 @@ system_test_nns(
     env = {
         "XNET_TEST_CANISTER_WASM_PATH": "$(rootpath //rs/rust_canisters/xnet_test:xnet-test-canister)",
     },
+    extra_head_nns_tags = ["manual"],  # Let's not run this expensive test against the HEAD NNS canisters to save resources.
     flaky = False,
     proc_macro_deps = MACRO_DEPENDENCIES,
     tags = [