diff --git a/pkgs/os-specific/linux/qemu-kvm/smb-tmpdir.patch b/pkgs/os-specific/linux/qemu-kvm/smb-tmpdir.patch
index c30ba9429dd9..6d6c7831d15e 100644
--- a/pkgs/os-specific/linux/qemu-kvm/smb-tmpdir.patch
+++ b/pkgs/os-specific/linux/qemu-kvm/smb-tmpdir.patch
@@ -1,19 +1,27 @@
 Honour $TMPDIR for the qemu-smb temporary directory.
 
 diff -rc -x '*~' qemu-kvm-0.12.2-orig/net/slirp.c qemu-kvm-0.12.2/net/slirp.c
-*** qemu-kvm-0.12.2-orig/net/slirp.c	2010-01-18 19:48:25.000000000 +0100
---- qemu-kvm-0.12.2/net/slirp.c	2010-02-01 15:56:43.000000000 +0100
+*** qemu-kvm-0.12.2-orig/net/slirp.c	2010-02-01 19:05:24.000000000 +0100
+--- qemu-kvm-0.12.2/net/slirp.c	2010-02-01 19:05:54.000000000 +0100
 ***************
-*** 480,486 ****
-      char smb_cmdline[128];
+*** 476,486 ****
+                       struct in_addr vserver_addr)
+  {
+      static int instance;
+!     char smb_conf[128];
+!     char smb_cmdline[128];
       FILE *f;
   
 !     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
                (long)getpid(), instance++);
       if (mkdir(s->smb_dir, 0700) < 0) {
           qemu_error("could not create samba server dir '%s'\n", s->smb_dir);
---- 480,489 ----
-      char smb_cmdline[128];
+--- 476,489 ----
+                       struct in_addr vserver_addr)
+  {
+      static int instance;
+!     char smb_conf[1024];
+!     char smb_cmdline[1024];
       FILE *f;
   
 !     char *tmpdir = getenv("TMPDIR");