diff --git a/cirro/cli/interactive/auth_args.py b/cirro/cli/interactive/auth_args.py
index 2359abdf..6072f328 100644
--- a/cirro/cli/interactive/auth_args.py
+++ b/cirro/cli/interactive/auth_args.py
@@ -1,9 +1,8 @@
 import logging
-import re
 from typing import Tuple, Dict
 
 from cirro.cli.interactive.utils import ask_yes_no, ask
-from cirro.config import list_tenants
+from cirro.config import list_tenants, extract_base_url
 
 logger = logging.getLogger()
 
@@ -21,8 +20,8 @@ def gather_auth_config() -> Tuple[str, str, Dict, bool]:
         choices=[tenant['domain'] for tenant in tenant_options],
         meta_information={tenant['domain']: tenant['displayName'] for tenant in tenant_options}
     )
-    # remove http(s):// if it's there
-    base_url = re.compile(r'https?://').sub('', base_url).strip('/').strip()
+    # Fix user-provided base URL, if necessary
+    base_url = extract_base_url(base_url)
 
     auth_method_config = {
         'enable_cache': ask_yes_no('Would you like to save your login? (do not use this on shared devices)')
diff --git a/cirro/config.py b/cirro/config.py
index 332b2116..633305c1 100644
--- a/cirro/config.py
+++ b/cirro/config.py
@@ -25,6 +25,14 @@ class UserConfig(NamedTuple):
     enable_additional_checksum: Optional[bool]
 
 
+def extract_base_url(base_url: str):
+    # remove http(s):// if it's there
+    base_url = re.compile(r'https?://').sub('', base_url).strip()
+    # remove anything after the first slash if it's there
+    base_url = base_url.split('/')[0]
+    return base_url
+
+
 def list_tenants() -> List[Tenant]:
     resp = requests.get(f'https://nexus.{Constants.default_base_url}/info')
     resp.raise_for_status()
diff --git a/tests/test_config_load.py b/tests/test_config_load.py
index 52aff3ff..9ad6e6a0 100644
--- a/tests/test_config_load.py
+++ b/tests/test_config_load.py
@@ -1,14 +1,27 @@
 import unittest
 
-from cirro.config import AppConfig, list_tenants
+from cirro.config import AppConfig, list_tenants, extract_base_url
+
+TEST_BASE_URL = "app.cirro.bio"
 
 
 class TestConfigLoad(unittest.TestCase):
     def test_config_load(self):
-        config = AppConfig(base_url="app.cirro.bio")
+        config = AppConfig(base_url=TEST_BASE_URL)
         self.assertIsNotNone(config.client_id)
         self.assertIsNotNone(config.auth_endpoint)
 
     def test_list_tenants(self):
         tenants = list_tenants()
         self.assertGreater(len(tenants), 1)
+
+    def test_extract_base(self):
+        test_cases = [
+            f"https://{TEST_BASE_URL}",
+            TEST_BASE_URL,
+            f"https://{TEST_BASE_URL}/projects",
+            f"{TEST_BASE_URL}/asd/",
+        ]
+        for test_case in test_cases:
+            with self.subTest(test_case):
+                self.assertEqual(TEST_BASE_URL, extract_base_url(test_case))