diff --git a/reflog.h b/reflog.h
index b996712c00..3bdd1ca8a5 100644
--- a/reflog.h
+++ b/reflog.h
@@ -23,8 +23,8 @@ struct reflog_expire_options {
 	int recno;
 };
 #define REFLOG_EXPIRE_OPTIONS_INIT(now) { \
-	.default_expire_total = now - 30 * 24 * 3600, \
-	.default_expire_unreachable = now - 90 * 24 * 3600, \
+	.default_expire_total = now - 90 * 24 * 3600, \
+	.default_expire_unreachable = now - 30 * 24 * 3600, \
 }
 
 /*
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index 8f78cf4b01..93b5b49e1d 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -153,6 +153,72 @@ test_expect_success 'reflog expire should not barf on an annotated tag' '
 	test_grep ! "error: [Oo]bject .* not a commit" err
 '
 
+test_expect_success 'reflog expire keeps reachable entries for 90 days' '
+	test_when_finished "rm -rf reachable-keep" &&
+	git init reachable-keep &&
+	(
+		cd reachable-keep &&
+		timestamp=$(test-tool date timestamp "60.days.ago") &&
+		timestamp=${timestamp#* -> } &&
+		test_commit --no-tag --date "$timestamp +0000" old &&
+		git reflog expire --all &&
+		test_stdout_line_count = 1 git reflog refs/heads/main
+	)
+'
+
+test_expect_success 'reflog expire removes reachable entries after 90 days' '
+	test_when_finished "rm -rf reachable-expire" &&
+	git init reachable-expire &&
+	(
+		cd reachable-expire &&
+		timestamp=$(test-tool date timestamp "100.days.ago") &&
+		timestamp=${timestamp#* -> } &&
+		test_commit --no-tag --date "$timestamp +0000" old &&
+		git reflog expire --all &&
+		test_stdout_line_count = 0 git reflog refs/heads/main
+	)
+'
+
+test_expect_success 'reflog expire keeps unreachable entries for 30 days' '
+	test_when_finished "rm -rf unreachable-keep" &&
+	git init unreachable-keep &&
+	(
+		cd unreachable-keep &&
+		test_commit --no-tag base &&
+		base=$(git rev-parse HEAD) &&
+		timestamp=$(test-tool date timestamp "20.days.ago") &&
+		timestamp=${timestamp#* -> } &&
+		test_commit --no-tag --date "$timestamp +0000" old &&
+		old=$(git rev-parse HEAD) &&
+		git update-ref refs/heads/main "$base" &&
+		git rev-list --all --objects >reachable &&
+		test_grep ! "$old" reachable &&
+		git reflog expire --all &&
+		git reflog --format='%H' refs/heads/main >actual &&
+		test_grep "$old" actual
+	)
+'
+
+test_expect_success 'reflog expire removes unreachable entries after 30 days' '
+	test_when_finished "rm -rf unreachable-expire" &&
+	git init unreachable-expire &&
+	(
+		cd unreachable-expire &&
+		test_commit --no-tag base &&
+		base=$(git rev-parse HEAD) &&
+		timestamp=$(test-tool date timestamp "40.days.ago") &&
+		timestamp=${timestamp#* -> } &&
+		test_commit --no-tag --date "$timestamp +0000" old &&
+		old=$(git rev-parse HEAD) &&
+		git update-ref refs/heads/main "$base" &&
+		git rev-list --all --objects >reachable &&
+		test_grep ! "$old" reachable &&
+		git reflog expire --all &&
+		git reflog --format='%H' refs/heads/main >actual &&
+		test_grep ! "$old" actual
+	)
+'
+
 test_expect_success 'corrupt and check' '
 
 	corrupt $F &&