diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 61fd78b1b1bd..ae46d44bd521 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -619,7 +619,7 @@ struct rb_entry {
 			unsigned int len;	/* length of the entry */
 		};
 		unsigned long long key;		/* 64-bits key */
-	};
+	} __packed;
 };
 
 struct extent_info {