diff --git a/packages/util/src/path.test.ts b/packages/util/src/path.test.ts
index 87dd4deb4f3..aa06f33d6b1 100644
--- a/packages/util/src/path.test.ts
+++ b/packages/util/src/path.test.ts
@@ -18,6 +18,21 @@ describe("client paths", () => {
     expect(getDirectory("")).toBe("")
   })
 
+  test.each([
+    ["/repo/src/index.ts///", "index.ts"],
+    ["C:\\repo\\src\\index.ts", "index.ts"],
+    ["C:\\repo/src\\file", "file"],
+    ["C:/repo\\src/file/\\", "file"],
+    ["/", ""],
+    ["\\", ""],
+    ["/\\/\\", ""],
+    ["C:\\", "C:"],
+    ["file", "file"],
+    ["", ""],
+  ])("reads the filename from %j", (path, filename) => {
+    expect(getFilename(path)).toBe(filename)
+  })
+
   test("keeps filename truncation stable", () => {
     expect(getFilenameTruncated("/repo/long-component-name.tsx", 16)).toBe("long-compon….tsx")
     expect(truncateMiddle("abcdefghijklmnop", 9)).toBe("abcd…mnop")
diff --git a/packages/util/src/path.ts b/packages/util/src/path.ts
index 59c9d6517f7..6d4f2ae1a9d 100644
--- a/packages/util/src/path.ts
+++ b/packages/util/src/path.ts
@@ -1,8 +1,8 @@
 export function getFilename(path: string | undefined) {
   if (!path) return ""
   const trimmed = path.replace(/[/\\]+$/, "")
-  const parts = trimmed.split(/[/\\]/)
-  return parts[parts.length - 1] ?? ""
+  const index = Math.max(trimmed.lastIndexOf("/"), trimmed.lastIndexOf("\\"))
+  return trimmed.slice(index + 1)
 }
 
 export function getDirectory(path: string | undefined) {