diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 0bfc7ffac..4da30e5a1 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -810,11 +810,20 @@ test_expect_success 'setup diff colors' '
 	git config color.diff.old red &&
 	git config color.diff.new green &&
 	git config color.diff.commit yellow &&
-	git config color.diff.whitespace "normal red" &&
+	git config color.diff.whitespace blue &&
 
-	git config core.autocrlf false &&
+	git config core.autocrlf false
+'
+
+test_expect_success 'diff that introduces a line with only tabs' '
+	git config core.whitespace blank-at-eol &&
+	git reset --hard &&
+	echo "test" >x &&
+	git commit -m "initial" x &&
+	echo "{NTN}" | tr "NT" "\n\t" >>x &&
+	git -c color.diff=always diff | test_decode_color >current &&
 
-	cat >expected <<-\EOF
+	cat >expected <<-\EOF &&
 	<BOLD>diff --git a/x b/x<RESET>
 	<BOLD>index 9daeafb..2874b91 100644<RESET>
 	<BOLD>--- a/x<RESET>
@@ -822,18 +831,10 @@ test_expect_success 'setup diff colors' '
 	<CYAN>@@ -1 +1,4 @@<RESET>
 	 test<RESET>
 	<GREEN>+<RESET><GREEN>{<RESET>
-	<GREEN>+<RESET><BRED>	<RESET>
+	<GREEN>+<RESET><BLUE>	<RESET>
 	<GREEN>+<RESET><GREEN>}<RESET>
 	EOF
-'
 
-test_expect_success 'diff that introduces a line with only tabs' '
-	git config core.whitespace blank-at-eol &&
-	git reset --hard &&
-	echo "test" >x &&
-	git commit -m "initial" x &&
-	echo "{NTN}" | tr "NT" "\n\t" >>x &&
-	git -c color.diff=always diff | test_decode_color >current &&
 	test_cmp expected current
 '