diff --git a/t/t9138-git-svn-authors-prog.sh b/t/t9138-git-svn-authors-prog.sh
index 83cc5fc9d1..2937f4c265 100755
--- a/t/t9138-git-svn-authors-prog.sh
+++ b/t/t9138-git-svn-authors-prog.sh
@@ -7,40 +7,39 @@ test_description='git svn authors prog tests'
 
 . ./lib-git-svn.sh
 
-cat > svn-authors-prog <<'EOF'
-#!/usr/bin/perl
-$_ = shift;
-if (s/-sub$//)  {
-	print "$_ <$_\@sub.example.com>\n";
-}
-else {
-	print "$_ <$_\@example.com>\n";
-}
+write_script svn-authors-prog "$PERL_PATH" <<-\EOF
+	$_ = shift;
+	if (s/-sub$//)  {
+		print "$_ <$_\@sub.example.com>\n";
+	} else {
+		print "$_ <$_\@example.com>\n";
+	}
 EOF
-chmod +x svn-authors-prog
 
-cat > svn-authors <<'EOF'
-ff = FFFFFFF FFFFFFF <fFf@other.example.com>
-EOF
+test_expect_success 'svn-authors setup' '
+	cat >svn-authors <<-\EOF
+	ff = FFFFFFF FFFFFFF <fFf@other.example.com>
+	EOF
+'
 
 test_expect_success 'setup svnrepo' '
 	for i in aa bb cc-sub dd-sub ee-foo ff
 	do
 		svn mkdir -m $i --username $i "$svnrepo"/$i
 	done
-	'
+'
 
 test_expect_success 'import authors with prog and file' '
 	git svn clone --authors-prog=./svn-authors-prog \
 	    --authors-file=svn-authors "$svnrepo" x
-	'
+'
 
 test_expect_success 'imported 6 revisions successfully' '
 	(
 		cd x
 		test "`git rev-list refs/remotes/git-svn | wc -l`" -eq 6
 	)
-	'
+'
 
 test_expect_success 'authors-prog ran correctly' '
 	(
@@ -56,7 +55,7 @@ test_expect_success 'authors-prog ran correctly' '
 		git rev-list -1 --pretty=raw refs/remotes/git-svn~5 | \
 		  grep "^author aa <aa@example\.com> "
 	)
-	'
+'
 
 test_expect_success 'authors-file overrode authors-prog' '
 	(
@@ -64,7 +63,7 @@ test_expect_success 'authors-file overrode authors-prog' '
 		git rev-list -1 --pretty=raw refs/remotes/git-svn | \
 		  grep "^author FFFFFFF FFFFFFF <fFf@other\.example\.com> "
 	)
-	'
+'
 
 git --git-dir=x/.git config --unset svn.authorsfile
 git --git-dir=x/.git config --unset svn.authorsprog