diff --git a/lib/buffer.js b/lib/buffer.js
index a0210b9b876..c23adb502e4 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -250,6 +250,7 @@ function Buffer(subject, encoding, offset) {
       this.parent = pool;
       this.offset = pool.used;
       pool.used += this.length;
+      if (pool.used & 7) pool.used = (pool.used + 8) & ~7;
     }
 
     // Treat array-ish objects as a byte array.