diff --git a/backend/app/pypi_proxy.py b/backend/app/pypi_proxy.py
index 9cbaa9a..164995f 100644
--- a/backend/app/pypi_proxy.py
+++ b/backend/app/pypi_proxy.py
@@ -180,7 +180,8 @@ async def pypi_simple_index(
             headers.update(_build_auth_headers(source))
             auth = _get_basic_auth(source)
 
-            simple_url = source.url.rstrip('/') + '/simple/'
+            # Use URL as-is - users should provide full path including /simple
+            simple_url = source.url.rstrip('/') + '/'
 
             timeout = httpx.Timeout(PROXY_READ_TIMEOUT, connect=PROXY_CONNECT_TIMEOUT)
 
@@ -268,7 +269,8 @@ async def pypi_package_versions(
             headers.update(_build_auth_headers(source))
             auth = _get_basic_auth(source)
 
-            package_url = source.url.rstrip('/') + f'/simple/{normalized_name}/'
+            # Use URL as-is - users should provide full path including /simple
+            package_url = source.url.rstrip('/') + f'/{normalized_name}/'
             final_url = package_url  # Track final URL after redirects
 
             timeout = httpx.Timeout(PROXY_READ_TIMEOUT, connect=PROXY_CONNECT_TIMEOUT)