diff --git a/func.S b/func.S
index 05ae52d..8d1a6b4 100644
--- a/func.S
+++ b/func.S
@@ -17,6 +17,7 @@
 errstr: .ascii "error happened\n"
 .set errstr_len, .-errstr
 
+.bss
 .set buffer_size, 1024*1024
 buffer:	.skip buffer_size, 0