diff --git a/coreutils-8.29-ls-abmon-width.patch b/coreutils-8.29-ls-abmon-width.patch
new file mode 100644
index 0000000..1022f01
--- /dev/null
+++ b/coreutils-8.29-ls-abmon-width.patch
@@ -0,0 +1,69 @@
+From 5a820c5a312d6a5b7a1a755cd0f81c84f7c676d7 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
+Date: Wed, 14 Mar 2018 11:31:43 -0700
+Subject: [PATCH] ls: increase the allowed abmon width from 5 to 12
+
+This will impact relatively few languages,
+and will make Arabic or Catalan etc.
+output unambiguous abbreviated month names.
+
+* src/ls.c (MAX_MON_WIDTH): Increase from 5 to 12.
+* tests/ls/abmon-align.sh: Augment to check for ambiguous output.
+Fixes https://bugs.gnu.org/30814
+
+Upstream-commit: 5ed2018360ba44f673b1dc74fb3d2927f7fcfae3
+Signed-off-by: Kamil Dudka <kdudka@redhat.com>
+---
+ src/ls.c                | 7 +++++--
+ tests/ls/abmon-align.sh | 9 ++++++---
+ 2 files changed, 11 insertions(+), 5 deletions(-)
+
+diff --git a/src/ls.c b/src/ls.c
+index 4becd06..b2983aa 100644
+--- a/src/ls.c
++++ b/src/ls.c
+@@ -1095,8 +1095,11 @@ file_escape_init (void)
+    variable width abbreviated months and also precomputing/caching
+    the names was seen to increase the performance of ls significantly.  */
+ 
+-/* max number of display cells to use */
+-enum { MAX_MON_WIDTH = 5 };
++/* max number of display cells to use.
++   As of 2018 the abmon for Arabic has entries with width 12.
++   It doesn't make much sense to support wider than this
++   and locales should aim for abmon entries of width <= 5.  */
++enum { MAX_MON_WIDTH = 12 };
+ /* abformat[RECENT][MON] is the format to use for timestamps with
+    recentness RECENT and month MON.  */
+ enum { ABFORMAT_SIZE = 128 };
+diff --git a/tests/ls/abmon-align.sh b/tests/ls/abmon-align.sh
+index e474047..a81266b 100755
+--- a/tests/ls/abmon-align.sh
++++ b/tests/ls/abmon-align.sh
+@@ -32,17 +32,20 @@ for format in "%b" "[%b" "%b]" "[%b]"; do
+     # The sed usage here is slightly different from the original,
+     # removing the \(.*\), to avoid triggering misbehavior in at least
+     # GNU sed 4.2 (possibly miscompiled) on Mac OS X (Darwin 9.8.0).
+-    n_widths=$(
++    months="$(
+       LC_ALL=$LOC TIME_STYLE=+"$format" ls -lgG *.ts |
+-      LC_ALL=C sed 's/.\{15\}//;s/ ..\.ts$//;s/ /./g' |
++      LC_ALL=C sed 's/.\{15\}//;s/ ..\.ts$//;s/ /./g')"
++    n_widths=$(echo "$months" |
+       while read mon; do echo "$mon" | LC_ALL=$LOC wc -L; done |
+       uniq | wc -l
+     )
++    n_dupes=$(echo "$months" | sort | uniq -d | wc -l)
+     test "$n_widths" = "1" || { fail=1; break 2; }
++    test "$n_dupes" = "0" || { fail=1; break 2; }
+   done
+ done
+ if test "$fail" = "1"; then
+-   echo "misalignment detected in $LOC locale:"
++   echo "misalignment or ambiguous output in $LOC locale:"
+    LC_ALL=$LOC TIME_STYLE=+%b ls -lgG *.ts
+ fi
+ 
+-- 
+2.14.3
+
diff --git a/coreutils.spec b/coreutils.spec
index 61611fc..28c8f2e 100644
--- a/coreutils.spec
+++ b/coreutils.spec
@@ -30,6 +30,9 @@ Patch4:   coreutils-8.29-fts-leaf-opt.patch
 # date, ls: pick strftime fixes from glibc to improve locale support (#1577872)
 Patch5:   coreutils-8.29-gnulib-strftime.patch
 
+# ls: increase the allowed abmon width from 5 to 12 (#1577872)
+Patch6:   coreutils-8.29-ls-abmon-width.patch
+
 # disable the test-lock gnulib test prone to deadlock
 Patch100: coreutils-8.26-test-lock.patch
 
@@ -281,6 +284,7 @@ fi
 
 %changelog
 * Mon May 28 2018 Kamil Dudka <kdudka@redhat.com> - 8.29-11
+- ls: increase the allowed abmon width from 5 to 12 (#1577872)
 - date, ls: pick strftime fixes from glibc to improve locale support (#1577872)
 
 * Fri Apr 20 2018 Kamil Dudka <kdudka@redhat.com> - 8.29-10