diff --git a/src/signals/path-matchers.ts b/src/signals/path-matchers.ts
index cb9fc8da54..9a5c17951c 100644
--- a/src/signals/path-matchers.ts
+++ b/src/signals/path-matchers.ts
@@ -264,6 +264,11 @@ const CONFIG_FILE_NAMES: ReadonlySet<string> = new Set([
   "azure-pipelines.yml",
   "buf.yaml",
   "buf.gen.yaml",
+  // Native/C++ build system definitions (siblings to Makefile/Dockerfile above).
+  "cmakelists.txt",
+  "meson.build",
+  "build.bazel",
+  "module.bazel",
 ]);
 
 // Filename prefixes that identify build, lint, test-runner, and environment config files.
diff --git a/test/unit/path-matchers.test.ts b/test/unit/path-matchers.test.ts
index d71cac2492..0b728d6e70 100644
--- a/test/unit/path-matchers.test.ts
+++ b/test/unit/path-matchers.test.ts
@@ -320,6 +320,10 @@ describe("isConfigFile", () => {
       ".github/workflows/ci.yml",
       ".github/workflows/release.yaml",
       ".circleci/config.yml",
+      "native/CMakeLists.txt",
+      "libs/core/meson.build",
+      "services/api/BUILD.bazel",
+      "MODULE.bazel",
     ]) {
       expect(isConfigFile(path)).toBe(true);
     }
@@ -410,6 +414,10 @@ describe("classifyChangedFile", () => {
       ["skaffold.yaml", "config"],
       ["Earthfile", "config"],
       ["Procfile", "config"],
+      ["native/CMakeLists.txt", "config"],
+      ["libs/meson.build", "config"],
+      ["services/BUILD.bazel", "config"],
+      ["MODULE.bazel", "config"],
       [".codecov.yml", "config"],
       ["codecov.yml", "config"],
       ["codecov.yaml", "config"],