diff --git a/t/t9350-fast-export.sh b/t/t9350-fast-export.sh
index 5690fe2810..756d6a9905 100755
--- a/t/t9350-fast-export.sh
+++ b/t/t9350-fast-export.sh
@@ -94,22 +94,30 @@ test_expect_success 'fast-export --show-original-ids | git fast-import' '
 	test $MUSS = $(git rev-parse --verify refs/tags/muss)
 '
 
-test_expect_success 'iso-8859-1' '
+test_expect_success 'iso-8859-7' '
 
-	git config i18n.commitencoding ISO8859-1 &&
-	# use author and committer name in ISO-8859-1 to match it.
-	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
+	test_when_finished "git reset --hard HEAD~1" &&
+	test_config i18n.commitencoding iso-8859-7 &&
 	test_tick &&
 	echo rosten >file &&
-	git commit -s -m den file &&
-	git fast-export wer^..wer >iso8859-1.fi &&
-	sed "s/wer/i18n/" iso8859-1.fi |
+	git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
+	git fast-export wer^..wer >iso-8859-7.fi &&
+	sed "s/wer/i18n/" iso-8859-7.fi |
 		(cd new &&
 		 git fast-import &&
+		 # The commit object, if not re-encoded, would be 240 bytes.
+		 # Removing the "encoding iso-8859-7\n" header drops 20 bytes.
+		 # Re-encoding the Pi character from \xF0 (\360) in iso-8859-7
+		 # to \xCF\x80 (\317\200) in UTF-8 adds a byte.  Check for
+		 # the expected size.
+		 test 221 -eq "$(git cat-file -s i18n)" &&
+		 # ...and for the expected translation of bytes.
 		 git cat-file commit i18n >actual &&
-		 grep "Áéí óú" actual)
-
+		 grep $(printf "\317\200") actual &&
+		 # Also make sure the commit does not have the "encoding" header
+		 ! grep ^encoding actual)
 '
+
 test_expect_success 'import/export-marks' '
 
 	git checkout -b marks master &&
@@ -224,7 +232,6 @@ GIT_COMMITTER_NAME='C O Mitter'; export GIT_COMMITTER_NAME
 
 test_expect_success 'setup copies' '
 
-	git config --unset i18n.commitencoding &&
 	git checkout -b copy rein &&
 	git mv file file3 &&
 	git commit -m move1 &&
diff --git a/t/t9350/simple-iso-8859-7-commit-message.txt b/t/t9350/simple-iso-8859-7-commit-message.txt
new file mode 100644
index 0000000000..8b3f0c3dba
--- /dev/null
+++ b/t/t9350/simple-iso-8859-7-commit-message.txt
@@ -0,0 +1 @@
+Pi: �
\ No newline at end of file