diff --git a/checks-Use-proper-format-modifier-for-size_t.patch b/checks-Use-proper-format-modifier-for-size_t.patch
new file mode 100644
index 0000000..71bf31c
--- /dev/null
+++ b/checks-Use-proper-format-modifier-for-size_t.patch
@@ -0,0 +1,41 @@
+From 497432fd2131967f349e69dc5d259072151cc4b4 Mon Sep 17 00:00:00 2001
+From: Thierry Reding <treding@nvidia.com>
+Date: Wed, 27 Sep 2017 15:04:09 +0200
+Subject: [PATCH 1/3] checks: Use proper format modifier for size_t
+
+The size of size_t can vary between architectures, so using %ld isn't
+going to work on 32-bit builds. Use the %zu modifier to make sure it is
+always correct.
+
+Signed-off-by: Thierry Reding <treding@nvidia.com>
+Acked-by: Rob Herring <robh@kernel.org>
+Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
+---
+ checks.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/checks.c b/checks.c
+index 902f2e3..08a3a29 100644
+--- a/checks.c
++++ b/checks.c
+@@ -972,7 +972,7 @@ static void check_property_phandle_args(struct check *c,
+ 	int cell, cellsize = 0;
+ 
+ 	if (prop->val.len % sizeof(cell_t)) {
+-		FAIL(c, dti, "property '%s' size (%d) is invalid, expected multiple of %ld in node %s",
++		FAIL(c, dti, "property '%s' size (%d) is invalid, expected multiple of %zu in node %s",
+ 		     prop->name, prop->val.len, sizeof(cell_t), node->fullpath);
+ 		return;
+ 	}
+@@ -1163,7 +1163,7 @@ static void check_interrupts_property(struct check *c,
+ 		return;
+ 
+ 	if (irq_prop->val.len % sizeof(cell_t))
+-		FAIL(c, dti, "property '%s' size (%d) is invalid, expected multiple of %ld in node %s",
++		FAIL(c, dti, "property '%s' size (%d) is invalid, expected multiple of %zu in node %s",
+ 		     irq_prop->name, irq_prop->val.len, sizeof(cell_t),
+ 		     node->fullpath);
+ 
+-- 
+2.13.5
+
diff --git a/dtc.spec b/dtc.spec
index 70e4cae..1b722c8 100644
--- a/dtc.spec
+++ b/dtc.spec
@@ -7,6 +7,7 @@ URL:           https://devicetree.org/
 
 Source:        https://ftp.kernel.org/pub/software/utils/%{name}/%{name}-%{version}.tar.xz
 Patch1:        use-tx-as-the-type-specifier-instead-of-zx.patch
+Patch2:        checks-Use-proper-format-modifier-for-size_t.patch
 
 BuildRequires: flex bison swig
 BuildRequires: python2-devel python2-setuptools
@@ -44,6 +45,7 @@ This package provides python2 bindings for libfdt
 %prep
 %setup -q
 %patch1 -p1
+%patch2 -p1
 
 %build
 make %{?_smp_mflags} V=1