diff --git a/src/utils.ts b/src/utils.ts
index 2c6670d..ef23b4e 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -118,7 +118,13 @@ export async function findProjectDir(
   // prefer bun.lockb over yarn.lock
   // In some cases, both bun.lockb and yarn.lock can exist in the same project.
   // https://bun.sh/docs/install/lockfile
-  const bunLockfile = path.join(dir, "bun.lockb");
+  const bunbLockfile = path.join(dir, "bun.lockb");
+  if (await fileExists(bunbLockfile)) {
+    logDebug(`Detected bun from lockfile ${bunbLockfile}`);
+    result.pkgManagerName = "bun";
+    return result;
+  }
+  const bunLockfile = path.join(dir, "bun.lock");
   if (await fileExists(bunLockfile)) {
     logDebug(`Detected bun from lockfile ${bunLockfile}`);
     result.pkgManagerName = "bun";
diff --git a/test/commands.test.ts b/test/commands.test.ts
index cccbfb4..4ceb392 100644
--- a/test/commands.test.ts
+++ b/test/commands.test.ts
@@ -277,7 +277,7 @@ describe("install", () => {
         ["i", "--bun", "--save-dev", "@std/encoding@0.216.0"],
         async (dir) => {
           assert.ok(
-            await isFile(path.join(dir, "bun.lockb")),
+            await isFile(path.join(dir, "bun.lock")),
             "bun lockfile not created",
           );
           const pkgJson = await readJson<PkgJson>(
@@ -333,7 +333,7 @@ describe("install", () => {
         ["i", "--bun", "--save-optional", "@std/encoding@0.216.0"],
         async (dir) => {
           assert.ok(
-            await isFile(path.join(dir, "bun.lockb")),
+            await isFile(path.join(dir, "bun.lock")),
             "bun lockfile not created",
           );
           const pkgJson = await readJson<PkgJson>(
@@ -440,7 +440,7 @@ describe("install", () => {
         ["i", "--bun", "@std/encoding@0.216.0"],
         async (dir) => {
           assert.ok(
-            await isFile(path.join(dir, "bun.lockb")),
+            await isFile(path.join(dir, "bun.lock")),
             "bun lockfile not created",
           );
 
@@ -584,7 +584,7 @@ describe("install", () => {
           ["i", "@std/encoding@0.216.0"],
           async (dir) => {
             assert.ok(
-              await isFile(path.join(dir, "bun.lockb")),
+              await isFile(path.join(dir, "bun.lock")),
               "bun lockfile not created",
             );
           },
diff --git a/test/utils.test.ts b/test/utils.test.ts
index 9e712ef..359fad7 100644
--- a/test/utils.test.ts
+++ b/test/utils.test.ts
@@ -42,6 +42,14 @@ describe("findProjectDir", () => {
     });
   });
 
+  it("should return bun if bun.lock is found", async () => {
+    await runInTempDir(async (tempDir) => {
+      await writeTextFile(path.join(tempDir, "bun.lock"), "");
+      const result = await findProjectDir(tempDir);
+      assert.strictEqual(result.pkgManagerName, "bun");
+    });
+  });
+
   it("should return bun if bun.lockb and yarn.lock are found", async () => {
     // bun allow to save bun.lockb and yarn.lock
     // https://bun.sh/docs/install/lockfile