diff --git a/aidial_client/_http_client/_base.py b/aidial_client/_http_client/_base.py
index d2f834e..19adf22 100644
--- a/aidial_client/_http_client/_base.py
+++ b/aidial_client/_http_client/_base.py
@@ -51,7 +51,7 @@ def _prepare_url(self, url: str) -> httpx.URL:
             merge_raw_path = (
                 self.base_url.raw_path + parsed_url.raw_path.lstrip(b"/")
             )
-            return self.base_url.copy_with(raw_path=merge_raw_path.rstrip(b"/"))
+            return self.base_url.copy_with(raw_path=merge_raw_path)
         return parsed_url
 
     def _build_request(
diff --git a/tests/test_prepare_url.py b/tests/test_prepare_url.py
new file mode 100644
index 0000000..4c47e67
--- /dev/null
+++ b/tests/test_prepare_url.py
@@ -0,0 +1,32 @@
+import pytest
+
+from aidial_client import AsyncDial, Dial
+
+BASE_URL = "http://localhost:8090"
+
+
+@pytest.fixture(params=[Dial, AsyncDial])
+def client(request):
+    return request.param(base_url=BASE_URL, api_key="dummy")
+
+
+@pytest.mark.parametrize(
+    "relative,expected_url",
+    [
+        (
+            "v1/metadata/files/bucket/appdata/app/",
+            f"{BASE_URL}/v1/metadata/files/bucket/appdata/app/",
+        ),
+        (
+            "v1/metadata/files/bucket/appdata/app",
+            f"{BASE_URL}/v1/metadata/files/bucket/appdata/app",
+        ),
+        ("/v1/foo/", f"{BASE_URL}/v1/foo/"),
+        ("v1/x/?foo=1", f"{BASE_URL}/v1/x/?foo=1"),
+        ("/", f"{BASE_URL}/"),
+        ("", f"{BASE_URL}/"),
+    ],
+)
+def test_prepare_url_preserves_trailing_slash(client, relative, expected_url):
+    prepared = client._http_client._prepare_url(relative)
+    assert str(prepared) == expected_url