diff --git a/gslib/tests/test_shim_util.py b/gslib/tests/test_shim_util.py
index 39f586019f..b5ca43f712 100644
--- a/gslib/tests/test_shim_util.py
+++ b/gslib/tests/test_shim_util.py
@@ -1082,7 +1082,7 @@ def test_gcs_json_endpoint_translation(self):
       self.assertEqual(
           env_vars, {
               'CLOUDSDK_API_ENDPOINT_OVERRIDES_STORAGE':
-                  'https://foo_host:1234/storage/v2',
+                  'https://foo_host:1234/storage/v2/',
           })
 
   def test_gcs_json_endpoint_translation_with_missing_port(self):
@@ -1094,10 +1094,11 @@ def test_gcs_json_endpoint_translation_with_missing_port(self):
     }):
       flags, env_vars = self._fake_command._translate_boto_config()
       self.assertEqual(flags, [])
-      self.assertEqual(env_vars, {
-          'CLOUDSDK_API_ENDPOINT_OVERRIDES_STORAGE':
-              'https://foo_host/storage/v2',
-      })
+      self.assertEqual(
+          env_vars, {
+              'CLOUDSDK_API_ENDPOINT_OVERRIDES_STORAGE':
+                  'https://foo_host/storage/v2/',
+          })
 
   def test_gcs_json_endpoint_translation_usees_default_version_v1(self):
     with _mock_boto_config(
@@ -1107,10 +1108,12 @@ def test_gcs_json_endpoint_translation_usees_default_version_v1(self):
         }}):
       flags, env_vars = self._fake_command._translate_boto_config()
       self.assertEqual(flags, [])
+      # Implicitly testing that the translation must start with
+      # https:// and end with a trailing forward slash.
       self.assertEqual(
           env_vars, {
               'CLOUDSDK_API_ENDPOINT_OVERRIDES_STORAGE':
-                  'https://foo_host:1234/storage/v1'
+                  'https://foo_host:1234/storage/v1/'
           })
 
   def test_s3_endpoint_translation(self):
diff --git a/gslib/utils/shim_util.py b/gslib/utils/shim_util.py
index 41745e49ef..2bc2297bed 100644
--- a/gslib/utils/shim_util.py
+++ b/gslib/utils/shim_util.py
@@ -248,8 +248,10 @@ def _get_gcs_json_endpoint_from_boto_config(config):
     gs_json_port = config.get('Credentials', 'gs_json_port')
     port = ':' + gs_json_port if gs_json_port else ''
     json_api_version = config.get('Credentials', 'json_api_version', 'v1')
-    return 'https://{}{}/storage/{}'.format(gs_json_host, port,
-                                            json_api_version)
+    # Note that the json endpoint must start with https://
+    # and end with a trailing forward slash.
+    return 'https://{}{}/storage/{}/'.format(gs_json_host, port,
+                                             json_api_version)
   return None