diff --git a/lib/buffer.js b/lib/buffer.js
index f4dfba860f..942fc35071 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -789,11 +789,10 @@ Buffer.prototype.toJSON = function() {
 
 
 function adjustOffset(offset, length) {
-  offset = +offset;
-  if (offset === 0 || Number.isNaN(offset)) {
+  offset |= 0;
+  if (offset === 0) {
     return 0;
-  }
-  if (offset < 0) {
+  } else if (offset < 0) {
     offset += length;
     return offset > 0 ? offset : 0;
   } else {
diff --git a/test/parallel/test-buffer-slice.js b/test/parallel/test-buffer-slice.js
index 133d056b17..e5b598e625 100644
--- a/test/parallel/test-buffer-slice.js
+++ b/test/parallel/test-buffer-slice.js
@@ -62,3 +62,13 @@ assert.strictEqual(Buffer.alloc(0).slice(0, 1).length, 0);
 
 // slice(0,0).length === 0
 assert.strictEqual(0, Buffer.from('hello').slice(0, 0).length);
+
+{
+  // Regression tests for https://github.com/nodejs/node/issues/9096
+  const buf = Buffer.from('abcd');
+  assert.strictEqual(buf.slice(buf.length / 3).toString(), 'bcd');
+  assert.strictEqual(
+    buf.slice(buf.length / 3, buf.length).toString(),
+    'bcd'
+  );
+}