diff --git a/tar-tree.c b/tar-tree.c
index 705b8fa1c..bd289a98f 100644
--- a/tar-tree.c
+++ b/tar-tree.c
@@ -94,7 +94,6 @@ static void write_blocked(void *buf, unsigned long size)
 	}
 	if (size) {
 		memcpy(block + offset, buf, size);
-		buf += size;
 		offset += size;
 	}
 	tail = offset % RECORDSIZE;