diff --git a/bucket.go b/bucket.go
index 9fadae1d7..8b93824d7 100644
--- a/bucket.go
+++ b/bucket.go
@@ -288,9 +288,14 @@ func (b *Bucket) Put(key []byte, value []byte) error {
 		return ErrValueTooLarge
 	}
 
+	// Insert into node.
+	// Tip: Use a new variable `newKey` instead of reusing the existing `key` to prevent
+	// it from being marked as leaking, and accordingly cannot be allocated on stack.
+	newKey := cloneBytes(key)
+
 	// Move cursor to correct position.
 	c := b.Cursor()
-	k, _, flags := c.seek(key)
+	k, _, flags := c.seek(newKey)
 
 	// Return an error if there is an existing key with a bucket value.
 	if bytes.Equal(key, k) && (flags&bucketLeafFlag) != 0 {
@@ -299,9 +304,7 @@ func (b *Bucket) Put(key []byte, value []byte) error {
 
 	// gofail: var beforeBucketPut struct{}
 
-	// Insert into node.
-	key = cloneBytes(key)
-	c.node().put(key, key, value, 0, 0)
+	c.node().put(newKey, newKey, value, 0, 0)
 
 	return nil
 }