diff --git a/packages/ui/src/lib/utils/string.test.ts b/packages/ui/src/lib/utils/string.test.ts
index 5cbf23f91..02b0582a9 100644
--- a/packages/ui/src/lib/utils/string.test.ts
+++ b/packages/ui/src/lib/utils/string.test.ts
@@ -35,6 +35,10 @@ describe.concurrent('branch slugify with valid characters', () => {
 	test('numbers are fine', () => {
 		expect(slugify('my/branch1')).toEqual('my/branch1');
 	});
+
+	test('underscores are fine', () => {
+		expect(slugify('my_branch')).toEqual('my_branch');
+	});
 });
 
 describe.concurrent('branch slugify with replaced characters', () => {
diff --git a/packages/ui/src/lib/utils/string.ts b/packages/ui/src/lib/utils/string.ts
index b641535d3..ac34f1162 100644
--- a/packages/ui/src/lib/utils/string.ts
+++ b/packages/ui/src/lib/utils/string.ts
@@ -44,7 +44,7 @@ export function slugify(input: string) {
 		.normalize('NFKD')
 		.replace(/[\u0300-\u036f]/g, '')
 		.trim()
-		.replace(/[^A-Za-z0-9/ -]/g, '')
+		.replace(/[^A-Za-z0-9_/ -]/g, '')
 		.replace(/\s+/g, '-')
 		.replace(/-+/g, '-');
 }