diff --git a/ocaml/xenopsd/scripts/qemu-wrapper b/ocaml/xenopsd/scripts/qemu-wrapper
index e5282564556..91aedeeb97c 100644
--- a/ocaml/xenopsd/scripts/qemu-wrapper
+++ b/ocaml/xenopsd/scripts/qemu-wrapper
@@ -66,7 +66,7 @@ def unshare(flags):
         raise OSError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))
 
 def restrict_fsize():
-    limit = 256 * 1024
+    limit = 1024 * 1024
     setrlimit(RLIMIT_FSIZE, (limit, limit))
 
 def enable_core_dumps():