diff --git a/packages/sdk-typescript/src/daemon/DaemonClient.ts b/packages/sdk-typescript/src/daemon/DaemonClient.ts
index 819c029435..7ea1dbd9ab 100644
--- a/packages/sdk-typescript/src/daemon/DaemonClient.ts
+++ b/packages/sdk-typescript/src/daemon/DaemonClient.ts
@@ -1827,16 +1827,15 @@ export class DaemonClient {
     opts: { offset?: number; maxBytes?: number } = {},
     clientId?: string,
   ): Promise<DaemonWorkspaceFileBytes> {
-    const url = new URL(`${this.baseUrl}/file/bytes`);
-    url.searchParams.set('path', filePath);
+    const query = new URLSearchParams({ path: filePath });
     if (opts.offset !== undefined) {
-      url.searchParams.set('offset', String(opts.offset));
+      query.set('offset', String(opts.offset));
     }
     if (opts.maxBytes !== undefined) {
-      url.searchParams.set('maxBytes', String(opts.maxBytes));
+      query.set('maxBytes', String(opts.maxBytes));
     }
     return await this.fetchWithTimeout(
-      url.toString(),
+      `${this.baseUrl}/file/bytes?${query.toString()}`,
       { headers: this.headers({}, clientId) },
       async (res) => {
         if (!res.ok) throw await this.failOnError(res, 'GET /file/bytes');
diff --git a/packages/sdk-typescript/test/unit/DaemonClient.test.ts b/packages/sdk-typescript/test/unit/DaemonClient.test.ts
index ca086d02df..0c0414dccd 100644
--- a/packages/sdk-typescript/test/unit/DaemonClient.test.ts
+++ b/packages/sdk-typescript/test/unit/DaemonClient.test.ts
@@ -583,6 +583,30 @@ describe('DaemonClient', () => {
       );
     });
 
+    it('reads raw bytes with a relative base URL', async () => {
+      const payload = {
+        kind: 'file_bytes' as const,
+        path: 'reports/report.pdf',
+        offset: 0,
+        sizeBytes: 2,
+        returnedBytes: 2,
+        truncated: false,
+        contentBase64: Buffer.from([1, 2]).toString('base64'),
+      };
+      const { fetch, calls } = recordingFetch(() => jsonResponse(200, payload));
+      const client = new DaemonClient({ baseUrl: '/daemon', fetch });
+
+      await expect(
+        client.readWorkspaceFileBytes('reports/report.pdf', {
+          offset: 0,
+          maxBytes: 2,
+        }),
+      ).resolves.toEqual(payload);
+      expect(calls[0]?.url).toBe(
+        '/daemon/file/bytes?path=reports%2Freport.pdf&offset=0&maxBytes=2',
+      );
+    });
+
     it('writes and edits files with JSON bodies and client identity', async () => {
       const writeResult = {
         kind: 'file_write',