diff --git a/builtin/log.c b/builtin/log.c
index 5ac18e28486b61b91239d859c445bc620c51c5ad..e8e51068bd903c01e12207637d59d80ea940bf2d 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1094,9 +1094,18 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 	}
 
 	if (rev->rdiff1) {
+		/*
+		 * Pass minimum required diff-options to range-diff; others
+		 * can be added later if deemed desirable.
+		 */
+		struct diff_options opts;
+		diff_setup(&opts);
+		opts.file = rev->diffopt.file;
+		opts.use_color = rev->diffopt.use_color;
+		diff_setup_done(&opts);
 		fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
 		show_range_diff(rev->rdiff1, rev->rdiff2,
-				rev->creation_factor, 1, NULL);
+				rev->creation_factor, 1, &opts);
 	}
 }
 
diff --git a/log-tree.c b/log-tree.c
index b243779a0b7dc15200689febe68549a85ce5c6a7..10680c139eeb530bc0e70e0c1713767b6ca5be21 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -755,14 +755,23 @@ void show_log(struct rev_info *opt)
 
 	if (cmit_fmt_is_mail(ctx.fmt) && opt->rdiff1) {
 		struct diff_queue_struct dq;
+		struct diff_options opts;
 
 		memcpy(&dq, &diff_queued_diff, sizeof(diff_queued_diff));
 		DIFF_QUEUE_CLEAR(&diff_queued_diff);
 
 		next_commentary_block(opt, NULL);
 		fprintf_ln(opt->diffopt.file, "%s", opt->rdiff_title);
+		/*
+		 * Pass minimum required diff-options to range-diff; others
+		 * can be added later if deemed desirable.
+		 */
+		diff_setup(&opts);
+		opts.file = opt->diffopt.file;
+		opts.use_color = opt->diffopt.use_color;
+		diff_setup_done(&opts);
 		show_range_diff(opt->rdiff1, opt->rdiff2,
-				opt->creation_factor, 1, NULL);
+				opt->creation_factor, 1, &opts);
 
 		memcpy(&diff_queued_diff, &dq, sizeof(diff_queued_diff));
 	}
diff --git a/t/t3206-range-diff.sh b/t/t3206-range-diff.sh
index e497c1358f8b2da6960d3d73db3cc75f9f7df85c..048feaf6ddf845279b30b7f1ebb7056c60e01c6d 100755
--- a/t/t3206-range-diff.sh
+++ b/t/t3206-range-diff.sh
@@ -248,18 +248,24 @@ test_expect_success 'dual-coloring' '
 for prev in topic master..topic
 do
 	test_expect_success "format-patch --range-diff=$prev" '
-		git format-patch --stdout --cover-letter --range-diff=$prev \
+		git format-patch --cover-letter --range-diff=$prev \
 			master..unmodified >actual &&
-		grep "= 1: .* s/5/A" actual &&
-		grep "= 2: .* s/4/A" actual &&
-		grep "= 3: .* s/11/B" actual &&
-		grep "= 4: .* s/12/B" actual
+		test_when_finished "rm 000?-*" &&
+		test_line_count = 5 actual &&
+		test_i18ngrep "^Range-diff:$" 0000-* &&
+		grep "= 1: .* s/5/A" 0000-* &&
+		grep "= 2: .* s/4/A" 0000-* &&
+		grep "= 3: .* s/11/B" 0000-* &&
+		grep "= 4: .* s/12/B" 0000-*
 	'
 done
 
 test_expect_success 'format-patch --range-diff as commentary' '
-	git format-patch --stdout --range-diff=HEAD~1 HEAD~1 >actual &&
-	test_i18ngrep "^Range-diff:$" actual
+	git format-patch --range-diff=HEAD~1 HEAD~1 >actual &&
+	test_when_finished "rm 0001-*" &&
+	test_line_count = 1 actual &&
+	test_i18ngrep "^Range-diff:$" 0001-* &&
+	grep "> 1: .* new message" 0001-*
 '
 
 test_done