diff --git a/src/cmd/vbackup/vbackup.c b/src/cmd/vbackup/vbackup.c
index 39e1b29c..5ed9409b 100644
--- a/src/cmd/vbackup/vbackup.c
+++ b/src/cmd/vbackup/vbackup.c
@@ -42,7 +42,7 @@
 
 enum
 {
-	STACK = 8192,
+	STACK = 32768,
 };
 
 typedef struct WriteReq WriteReq;