diff --git a/lib/buffer.js b/lib/buffer.js
index 22bbb95eaf79e6..4b755e1e3f0d22 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -593,6 +593,15 @@ Buffer.concat = function concat(list, length) {
     validateOffset(length, 'length');
   }
 
+  // If there is only one FastBuffer, rotate without copying
+  if (
+    list.length === 1 &&
+    list[0] instanceof FastBuffer &&
+    list[0].length === length
+  ) {
+    return Buffer.from(list[0]);
+  }
+
   const buffer = Buffer.allocUnsafe(length);
   let pos = 0;
   for (let i = 0; i < list.length; i++) {
diff --git a/test/parallel/test-buffer-concat.js b/test/parallel/test-buffer-concat.js
index 2e7541fb58b063..3531f98de8059d 100644
--- a/test/parallel/test-buffer-concat.js
+++ b/test/parallel/test-buffer-concat.js
@@ -44,6 +44,18 @@ assert.notStrictEqual(flatOne, one[0]);
 assert.strictEqual(flatLong.toString(), check);
 assert.strictEqual(flatLongLen.toString(), check);
 
+{
+  const original = Buffer.from('fast');
+  const result = Buffer.concat([original], original.length);
+
+  const msgRef =
+    'Buffer.concat should return a new Buffer instance even with single FastBuffer';
+  const msgEq = 'Buffer.concat output should equal original content';
+
+  assert.notStrictEqual(result, original, msgRef);
+  assert.deepStrictEqual(result, original, msgEq);
+}
+
 [undefined, null, Buffer.from('hello')].forEach((value) => {
   assert.throws(() => {
     Buffer.concat(value);