diff --git a/0001-helper-Don-t-crash-if-SUPERMIN_DTB-is-set-and-no-dtb.patch b/0001-helper-Don-t-crash-if-SUPERMIN_DTB-is-set-and-no-dtb.patch
new file mode 100644
index 0000000..6de5782
--- /dev/null
+++ b/0001-helper-Don-t-crash-if-SUPERMIN_DTB-is-set-and-no-dtb.patch
@@ -0,0 +1,39 @@
+From a55d9cf1579f14545636b3d7a2f515c413603107 Mon Sep 17 00:00:00 2001
+From: "Richard W.M. Jones" <rjones@redhat.com>
+Date: Sun, 8 Sep 2013 11:13:24 +0100
+Subject: [PATCH] helper: Don't crash if SUPERMIN_DTB is set and no --dtb on
+ the command line.
+
+Libguestfs uses supermin-helper -f checksum w/o --dtb.  Setting the
+SUPERMIN_DTB environment variable would cause supermin-helper to
+crash.  Instead of crashing, just ignore SUPERMIN_DTB.
+---
+ helper/kernel.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/helper/kernel.c b/helper/kernel.c
+index 4ff207b..5c8175d 100644
+--- a/helper/kernel.c
++++ b/helper/kernel.c
+@@ -122,15 +122,15 @@ has_modpath (const char *kernel_name)
+ static void
+ get_dtb (const char *kernel, const char *dtb_wildcard, const char *dtb)
+ {
++  if (!dtb_wildcard)
++    return;
++
+   char *dtb_env = getenv ("SUPERMIN_DTB");
+   if (dtb_env) {
+     copy_or_symlink_file ("dtb", dtb_env, dtb);
+     return;
+   }
+ 
+-  if (!dtb_wildcard)
+-    return;
+-
+   assert (dtb);      /* command line arg parsing should ensure this */
+   assert (kernel != NULL);
+ 
+-- 
+1.8.3.1
+
diff --git a/supermin.spec b/supermin.spec
index 2b917ac..746d8a9 100644
--- a/supermin.spec
+++ b/supermin.spec
@@ -1,7 +1,7 @@
 Summary:       Tool for creating supermin appliances
 Name:          supermin
 Version:       4.1.5
-Release:       1%{?dist}
+Release:       2%{?dist}
 License:       GPLv2+
 
 %if 0%{?rhel} >= 7
@@ -11,6 +11,10 @@ ExclusiveArch: x86_64
 URL:           http://people.redhat.com/~rjones/supermin/
 Source0:       http://libguestfs.org/download/supermin/%{name}-%{version}.tar.gz
 
+# (For ARM) Don't crash if SUPERMIN_DTB is set and --dtb not specified.
+# Upstream since 2013-09-08.
+Patch1:        0001-helper-Don-t-crash-if-SUPERMIN_DTB-is-set-and-no-dtb.patch
+
 BuildRequires: /usr/bin/pod2man
 BuildRequires: yum >= 3.2
 BuildRequires: /usr/sbin/mke2fs
@@ -61,6 +65,8 @@ Obsoletes:     febootstrap-supermin-helper <= 3.21-1
 %prep
 %setup -q
 
+%patch1 -p1
+
 
 %build
 %configure --disable-network-tests
@@ -95,6 +101,9 @@ make check
 
 
 %changelog
+* Sun Sep  8 2013 Richard W.M. Jones <rjones@redhat.com> - 4.1.5-2
+- (For ARM) Don't crash if SUPERMIN_DTB is set and --dtb not specified.
+
 * Fri Sep  6 2013 Richard W.M. Jones <rjones@redhat.com> - 4.1.5-1
 - New upstream version 4.1.5.
 - Has (optionally) a new command line syntax.