Oops, one pop too many.
diff --git a/Python/compile.c b/Python/compile.c
index 0bfae14..e8462c6 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1916,7 +1916,6 @@
 	com_addbyte(c, DUP_TOP);
 	com_push(c, 1);
 	com_addopname(c, LOAD_ATTR, n);
-	com_pop(c, 1);
 	com_node(c, augn);
 	com_addbyte(c, opcode);
 	com_pop(c, 1);