diff --git a/SOURCES/diffutils-cmp-sentinel.patch b/SOURCES/diffutils-cmp-sentinel.patch
new file mode 100644
index 0000000..683d22e
--- /dev/null
+++ b/SOURCES/diffutils-cmp-sentinel.patch
@@ -0,0 +1,51 @@
+From ffd63aedad3c0eb08ebb27103e5f242f8732dc0c Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Tue, 24 Jul 2018 10:18:28 -0700
+Subject: cmp: fix bug in -b diagnostic
+
+Problem reported by mancha (Bug#32249).
+* src/cmp.c (count_newlines): Restore old value of sentinel.
+* tests/cmp: Test for the bug.
+---
+ src/cmp.c |  2 ++
+ tests/cmp | 10 ++++++++++
+ 2 files changed, 12 insertions(+)
+
+diff --git a/src/cmp.c b/src/cmp.c
+index 04638e3..2811392 100644
+--- a/src/cmp.c
++++ b/src/cmp.c
+@@ -639,9 +639,11 @@ count_newlines (char *buf, size_t bufsize)
+   size_t count = 0;
+   char *p;
+   char *lim = buf + bufsize;
++  char ch = *lim;
+   *lim = '\n';
+   for (p = buf; (p = rawmemchr (p, '\n')) != lim; p++)
+     count++;
++  *lim = ch;
+   return count;
+ }
+ 
+diff --git a/tests/cmp b/tests/cmp
+index 160c1ea..ca0fe5e 100755
+--- a/tests/cmp
++++ b/tests/cmp
+@@ -208,4 +208,14 @@ done >out1
+ 
+ compare exp1 out1 || fail=1
+ 
++printf 'bad\n' >bad
++printf 'bug\n' >bug
++echo LC_ALL=C cmp -b bad bug
++LC_ALL=C cmp -b bad bug
++test $? -eq 1 || fail=1
++case `LC_ALL=C cmp -b bad bug` in
++  'bad bug differ: byte 2, line 1 is '*' a '*' u') ;;
++  *) echo 'expected cmp -b to report a and u'; fail=1;;
++esac
++
+ Exit $fail
+-- 
+cgit v1.0-41-gc330
+
diff --git a/SPECS/diffutils.spec b/SPECS/diffutils.spec
index e9a937e..b967e6a 100644
--- a/SPECS/diffutils.spec
+++ b/SPECS/diffutils.spec
@@ -1,13 +1,14 @@
 Summary: A GNU collection of diff utilities
 Name: diffutils
 Version: 3.6
-Release: 5%{?dist}
+Release: 5%{?dist}.0.1
 Group: Applications/Text
 URL: http://www.gnu.org/software/diffutils/diffutils.html
 Source: ftp://ftp.gnu.org/gnu/diffutils/diffutils-%{version}.tar.xz
 Patch1: diffutils-cmp-s-empty.patch
 Patch2: diffutils-i18n.patch
 Patch3: diffutils-3.6-covscan.patch
+Patch9999: diffutils-cmp-sentinel.patch
 License: GPLv3+
 Requires(post): info
 Requires(preun): info
@@ -37,6 +38,8 @@ Install diffutils if you need to compare text files.
 # covscan issues
 %patch3 -p1 -b .covscan
 
+%patch9999 -p1
+
 # Run autoreconf for aarch64 support (bug #925256).
 autoreconf
 
@@ -78,6 +81,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_infodir}/diffutils.info*gz
 
 %changelog
+* Sat Aug 10 2019 Pablo Greco <pgreco@centoproject.org> - 3.6-5.0.1
+- Fix cmp
+
 * Mon Aug 13 2018 Than Ngo <than@redhat.com> - 3.6-5
 - Resolves: #1606949, covscan issues