diff --git a/util/build-gnu.sh b/util/build-gnu.sh
index 4a14f3f6c..4b682f4ad 100755
--- a/util/build-gnu.sh
+++ b/util/build-gnu.sh
@@ -272,6 +272,9 @@ sed -i -Ez "s/\n([^\n#]*pad-3\.2[^\n]*)\n([^\n]*)\n([^\n]*)/\n# uutils\/numfmt s
 sed -i -e "s/\$prog: multiple field specifications/error: The argument '--field <FIELDS>' was provided more than once, but cannot be used multiple times\n\nUsage: numfmt [OPTION]... [NUMBER]...\n\n\nFor more information try '--help'/g" tests/misc/numfmt.pl
 sed -i -e "s/Try 'mv --help' for more information/For more information, try '--help'/g" -e "s/mv: missing file operand/error: the following required arguments were not provided:\n  <files>...\n\nUsage: mv [OPTION]... [-T] SOURCE DEST\n       mv [OPTION]... SOURCE... DIRECTORY\n       mv [OPTION]... -t DIRECTORY SOURCE...\n/g" -e "s/mv: missing destination file operand after 'no-file'/error: The argument '<files>...' requires at least 2 values, but only 1 was provided\n\nUsage: mv [OPTION]... [-T] SOURCE DEST\n       mv [OPTION]... SOURCE... DIRECTORY\n       mv [OPTION]... -t DIRECTORY SOURCE...\n/g" tests/mv/diag.sh
 
+# our error message is better
+sed -i -e "s|mv: cannot overwrite 'a/t': Directory not empty|mv: cannot move 'b/t' to 'a/t': Directory not empty|" tests/mv/dir2dir.sh
+
 # GNU doesn't support width > INT_MAX
 # disable these test cases
 sed -i -E "s|^([^#]*2_31.*)$|#\1|g" tests/printf/printf-cov.pl