diff --git a/.gitignore b/.gitignore
index 959d302..35c1ef4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,3 +52,5 @@ nasm-2.08.01-xdoc.tar.bz2
 /nasm-2.13.01-xdoc.tar.bz2
 /nasm-2.13.02.tar.bz2
 /nasm-2.13.02-xdoc.tar.bz2
+/nasm-2.13.03.tar.bz2
+/nasm-2.13.03-xdoc.tar.bz2
diff --git a/0001-Remove-invalid-pure_func-qualifiers.patch b/0001-Remove-invalid-pure_func-qualifiers.patch
new file mode 100644
index 0000000..87ec601
--- /dev/null
+++ b/0001-Remove-invalid-pure_func-qualifiers.patch
@@ -0,0 +1,27 @@
+From d0dabb46a821b2506681f882af0d5696d2c2bade Mon Sep 17 00:00:00 2001
+From: Michael Simacek <msimacek@redhat.com>
+Date: Thu, 8 Feb 2018 14:47:08 +0100
+Subject: [PATCH] Remove invalid pure_func qualifiers
+
+---
+ include/nasmlib.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/nasmlib.h b/include/nasmlib.h
+index 79e866b..c93cef0 100644
+--- a/include/nasmlib.h
++++ b/include/nasmlib.h
+@@ -191,8 +191,8 @@ int64_t readstrnum(char *str, int length, bool *warn);
+  * seg_init: Initialise the segment-number allocator.
+  * seg_alloc: allocate a hitherto unused segment number.
+  */
+-void pure_func seg_init(void);
+-int32_t pure_func seg_alloc(void);
++void seg_init(void);
++int32_t seg_alloc(void);
+ 
+ /*
+  * many output formats will be able to make use of this: a standard
+-- 
+2.14.3
+
diff --git a/nasm.spec b/nasm.spec
index 38c62d3..1db1399 100644
--- a/nasm.spec
+++ b/nasm.spec
@@ -7,13 +7,16 @@
 
 Summary: A portable x86 assembler which uses Intel-like syntax
 Name: nasm
-Version: 2.13.02
-Release: 3%{?dist}
+Version: 2.13.03
+Release: 1%{?dist}
 License: BSD
 URL: http://www.nasm.us
 Source0: http://www.nasm.us/pub/nasm/releasebuilds/%{version}/%{name}-%{version}.tar.bz2
 Source1: http://www.nasm.us/pub/nasm/releasebuilds/%{version}/%{name}-%{version}-xdoc.tar.bz2
 
+# Submitted upstream: https://bugzilla.nasm.us/show_bug.cgi?id=3392461
+Patch1:  0001-Remove-invalid-pure_func-qualifiers.patch
+
 BuildRequires: perl(Env)
 BuildRequires: autoconf
 BuildRequires: asciidoc
@@ -59,6 +62,8 @@ include linker, library manager, loader, and information dump.
 
 tar xjf %{SOURCE1} --strip-components 1
 
+%patch1 -p1
+
 %build
 autoreconf
 %configure
@@ -98,6 +103,9 @@ make INSTALLROOT=$RPM_BUILD_ROOT install install_rdf
 %{_mandir}/man1/ld*
 
 %changelog
+* Thu Feb 08 2018 Michael Simacek <msimacek@redhat.com> - 2.13.03-1
+- Update to upstream version 2.13.03
+
 * Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2.13.02-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
 
diff --git a/sources b/sources
index ebd7af5..b550c8a 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (nasm-2.13.02.tar.bz2) = 96b8d66fa15a1a6a78fc4ce88029fb406d9904d1e1b65d42b07914c3128d4dc84b4c986a866204a6f25448b0a5eeaa1d0e1147459769765343ddb6ad73edcc0e
-SHA512 (nasm-2.13.02-xdoc.tar.bz2) = 696523f1bdfa9091a80e247dd448bb42392d07dca1cb4f7c9f75cd4f68d81c811034e03b9245fe5cbde1a9947bb3deed0476a9ea4abad87ebad6b0133917ee7a
+SHA512 (nasm-2.13.03.tar.bz2) = d7a6b4cee8dfd603d8d4c976e5287b5cc542fa0b466ff989b743276a6e28114e64289bf02a7819eca63142a5278aa6eed57773007e5f589e15768e6456a8919d
+SHA512 (nasm-2.13.03-xdoc.tar.bz2) = 8bcbff987a18c0649c8f49466c3eeb8fd2beabb6309a3a39a4ef172874771253b7aecb3a1f375ffde8b7ae3522f67ee478ee07f88dc58421fd6b7f0f912fb645