diff --git a/mtools-4.0.43-errmsgsize.patch b/mtools-4.0.43-errmsgsize.patch
new file mode 100644
index 0000000..ab3a724
--- /dev/null
+++ b/mtools-4.0.43-errmsgsize.patch
@@ -0,0 +1,13 @@
+diff -up mtools-4.0.43/mcopy.c.orig mtools-4.0.43/mcopy.c
+--- mtools-4.0.43/mcopy.c.orig	2024-08-20 18:41:43.957181199 +0200
++++ mtools-4.0.43/mcopy.c	2024-08-20 18:40:51.921966014 +0200
+@@ -196,7 +196,8 @@ static int _unix_write(MainParam_t *mp,
+ 	Stream_t *File=mp->File;
+ 	Stream_t *Target, *Source;
+ 	struct MT_STAT stbuf;
+-	char errmsg[80];
++	/* matches buffer size in SimpleFileOpenWithLm() */
++	char errmsg[200];
+ 
+ 	File->Class->get_data(File, &mtime, 0, 0, 0);
+ 
diff --git a/mtools.spec b/mtools.spec
index c08d4b9..659e3fa 100644
--- a/mtools.spec
+++ b/mtools.spec
@@ -6,6 +6,7 @@ License: GPL-3.0-or-later
 Source0: ftp://ftp.gnu.org/gnu/mtools/mtools-%{version}.tar.gz
 Url: https://www.gnu.org/software/mtools/
 Patch0: mtools-3.9.6-config.patch
+Patch1: mtools-4.0.43-errmsgsize.patch
 
 BuildRequires: make
 BuildRequires: gcc
@@ -31,6 +32,7 @@ Mtools should be installed if you need to use MS-DOS disks
 %prep
 %setup -q -n %{name}-%{version}
 %patch 0 -p1 -b .conf
+%patch 1 -p1
 
 %build
 autoreconf -fiv