diff --git a/time-1.9-Fix-formatting-a-trailing-backslash-and-a-percent-si.patch b/time-1.9-Fix-formatting-a-trailing-backslash-and-a-percent-si.patch
new file mode 100644
index 0000000..c61de51
--- /dev/null
+++ b/time-1.9-Fix-formatting-a-trailing-backslash-and-a-percent-si.patch
@@ -0,0 +1,68 @@
+From f88ec3114dfdb5f284367d7602a06dc021409616 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
+Date: Fri, 26 Jan 2024 10:36:07 +0100
+Subject: [PATCH] Fix formatting a trailing backslash and a percent sign
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+There was a bug report that a trailing backslash leads to printing
+a nul byte and an commandline:
+
+$ /usr/bin/time -f 'abc\' sleep 1 2>&1 | hexdump -vC
+00000000  61 62 63 3f 5c 00 73 6c  65 65 70 0a              |abc?\.sleep.|
+0000000c
+
+This patch fixes it.
+
+A similar fix was already in place for a trailing percent sign, but it
+was missing printing an implicit newline as mandated by
+the documentation. This patch fixes it either.
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ src/time.c | 12 +++++++++---
+ 1 file changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/src/time.c b/src/time.c
+index 2f2b702..2184e4e 100644
+--- a/src/time.c
++++ b/src/time.c
+@@ -585,12 +585,13 @@ summarize (fp, fmt, command, resp)
+ 	      break;
+ 	    case '\0':
+ 	      putc ('?', fp);
+-	      return;
++	      break;
+ 	    default:
+ 	      putc ('?', fp);
+ 	      putc (*fmt, fp);
+ 	    }
+-	  ++fmt;
++	  if (*fmt != '\0')
++	    ++fmt;
+ 	  break;
+ 
+ 	case '\\':		/* Format escape.  */
+@@ -605,12 +606,17 @@ summarize (fp, fmt, command, resp)
+ 	    case '\\':
+ 	      putc ('\\', fp);
+ 	      break;
++	    case '\0':
++	      putc ('?', fp);
++	      putc ('\\', fp);
++	      break;
+ 	    default:
+ 	      putc ('?', fp);
+ 	      putc ('\\', fp);
+ 	      putc (*fmt, fp);
+ 	    }
+-	  ++fmt;
++	  if (*fmt != '\0')
++	    ++fmt;
+ 	  break;
+ 
+ 	default:
+-- 
+2.43.0
+
diff --git a/time.spec b/time.spec
index c8bf74c..919d1cd 100644
--- a/time.spec
+++ b/time.spec
@@ -1,7 +1,7 @@
 Summary:    A GNU utility for monitoring a program's use of system resources
 Name:       time
 Version:    1.9
-Release:    22%{?dist}
+Release:    23%{?dist}
 # src/time.c:               GPL-3.0-or-later
 # COPYING:                  GPL-3.0 text
 # doc/time.texi:            GFDL-1.3-no-invariants-or-later
@@ -62,6 +62,9 @@ Patch3:     time-1.9-Close-outfp-before-exec.patch
 # to increase RSS in 5 MB). In addition there is regression in ppc64le kernel
 # (bug #2212765) which always fails.
 Patch4:     time-1.9-drop-flawed-rss-test.patch
+# Fix formatting a trailing backslash, proposed to the upstream,
+# <https://lists.gnu.org/archive/html/bug-time/2024-01/msg00000.html>
+Patch5:     time-1.9-Fix-formatting-a-trailing-backslash-and-a-percent-si.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  bash
@@ -87,6 +90,7 @@ the results.
 touch -d "$(sed -n -e '/^Date: /{s/^[^:]*: //;p}' %{PATCH2})" doc/time.texi
 %patch -P3 -p1
 %patch -P4 -p1
+%patch -P5 -p1
 # Correct version VERSION flag for doc/time.texi
 # <https://lists.gnu.org/archive/html/bug-time/2021-01/msg00000.html>
 printf '%{version}\n' > .tarball-version
@@ -112,6 +116,9 @@ rm -f $RPM_BUILD_ROOT%{_infodir}/dir
 # time(1) manual page lives in man-pages package, bug #1612294.
 
 %changelog
+* Fri Jan 26 2024 Petr Pisar <ppisar@redhat.com> - 1.9-23
+- Fix formatting a trailing backslash
+
 * Sat Jul 22 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1.9-22
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild