diff --git a/SOURCES/memtest86+-5.01-serial-console-fix.patch b/SOURCES/memtest86+-5.01-serial-console-fix.patch
new file mode 100644
index 0000000..2cacd12
--- /dev/null
+++ b/SOURCES/memtest86+-5.01-serial-console-fix.patch
@@ -0,0 +1,13 @@
+diff --git a/lib.c b/lib.c
+index a2b829d..6a7e210 100644
+--- a/lib.c
++++ b/lib.c
+@@ -1141,7 +1141,7 @@ void serial_console_setup(char *param)
+ 
+ 	end++;
+ 
+-	if (*end != '\0' || *end != ' ')
++	if (*end != '\0' && *end != ' ')
+ 		return;  /* garbage at the end */
+ 
+ 	serial_bits = bits;
diff --git a/SPECS/memtest86+.spec b/SPECS/memtest86+.spec
index ad36e45..bdb71da 100644
--- a/SPECS/memtest86+.spec
+++ b/SPECS/memtest86+.spec
@@ -9,7 +9,7 @@
 
 Name:     memtest86+
 Version:  5.01
-Release:  19%{?dist}
+Release:  20%{?dist}
 License:  GPLv2
 Summary:  Stand-alone memory tester for x86 and x86-64 computers
 Group:    System Environment/Base
@@ -30,6 +30,7 @@ Patch1:   memtest86+-5.01-no-optimization.patch
 Patch2:   memtest86+-5.01-compile-fix.patch
 Patch3:   memtest86+-5.01-crash-fix.patch
 Patch4:   memtest86+-5.01-fgnu89-inline.patch
+Patch5:   memtest86+-5.01-serial-console-fix.patch
 URL:      http://www.memtest.org
 # require glibc-devel.i386 via this file:
 BuildRequires: %{_includedir}/gnu/stubs-32.h
@@ -59,6 +60,7 @@ cp -p %{SOURCE6} README.%{readme_suffix}
 %patch2 -p1 -b .compile-fix
 %patch3 -p1 -b .crash-fix
 %patch4 -p1 -b .fgnu89-inline
+%patch5 -p1 -b .serial-console-fix
 
 #sed -i -e's,0x10000,0x100000,' memtest.lds
 %ifarch x86_64
@@ -121,6 +123,10 @@ fi
 %{_mandir}/man8/*.8.gz
 
 %changelog
+* Thu Oct 22 2020 Jaroslav Škarvada <jskarvad@redhat.com> - 5.01-20
+- Fixed serial console
+  Resolves: rhbz#1696877
+
 * Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 5.01-19
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild