diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3639f9a2..cb2d327e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@
 * Updated to Realm Core 5.4.0.
 * Updated to Realm Sync 3.0.0-rc.1.
 * Tested against Realm Object Server 3.0.0-alpha.8.
+* Added `_disablePartialSyncUrlChecks` to `Realm.Configuration`.
 
 2.2.15 Release notes (2018-3-9)
 =============================================================
diff --git a/lib/index.d.ts b/lib/index.d.ts
index 79730398..367ece6f 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -379,6 +379,7 @@ declare namespace Realm.Sync {
         open_ssl_verify_callback?: SSLVerifyCallback;
         error?: ErrorCallback;
         partial?: boolean;
+        _disablePartialSyncUrlChecks?:boolean;
     }
 
     type ProgressNotificationCallback = (transferred: number, transferable: number) => void;
diff --git a/src/js_sync.hpp b/src/js_sync.hpp
index 1a3ff6d0..9958c523 100644
--- a/src/js_sync.hpp
+++ b/src/js_sync.hpp
@@ -823,7 +823,19 @@ void SyncClass<T>::populate_sync_config(ContextType ctx, ObjectType realm_constr
             is_partial = Value::validated_to_boolean(ctx, partial_value);
         }
 
-        config.sync_config = std::make_shared<SyncConfig>(shared_user, std::move(raw_realm_url));
+        bool disable_partial_sync_url_checks = false;
+        ValueType disable_partial_sync_url_checks_value = Object::get_property(ctx, sync_config_object, "_disablePartialSyncUrlChecks");
+        if (!Value::is_undefined(ctx, disable_partial_sync_url_checks_value)) {
+            disable_partial_sync_url_checks = Value::validated_to_boolean(ctx, disable_partial_sync_url_checks_value);
+        }
+
+        if (disable_partial_sync_url_checks) {
+            config.sync_config = std::make_shared<SyncConfig>(shared_user, std::move(""));
+            config.sync_config->reference_realm_url = std::move(raw_realm_url);
+        }
+        else {
+            config.sync_config = std::make_shared<SyncConfig>(shared_user, std::move(raw_realm_url));
+        }
         config.sync_config->bind_session_handler = std::move(bind);
         config.sync_config->error_handler = std::move(error_handler);
         config.sync_config->client_validate_ssl = client_validate_ssl;
diff --git a/tests/js/session-tests.js b/tests/js/session-tests.js
index 97c8db41..7edc22d1 100644
--- a/tests/js/session-tests.js
+++ b/tests/js/session-tests.js
@@ -749,6 +749,36 @@ module.exports = {
             });
     },
 
+    testOpenPartialSyncUrl() {
+        if (!isNodeProccess) {
+            return;
+        }
+
+        const username = uuid();
+        return Realm.Sync.User.register('http://localhost:9080', username, 'password')
+            .then(user => {
+                let config1 = {
+                    sync: {
+                        user: user,
+                        url: `realm://localhost:9080/~/default/__partial/`,
+                        partial: true,
+                        _disablePartialSyncUrlChecks: true
+                    }
+                };
+                const realm = new Realm(config1);
+                TestCase.assertFalse(realm.isClosed);
+
+                let config2 = {
+                    sync: {
+                        user: user,
+                        url: `realm://localhost:9080/~/default/__partial/`,  // <--- not allowed URL
+                        partial: true,
+                    }
+                };
+                TestCase.assertThrows(() => new Realm(config2));
+            });
+    },
+
     testPartialSyncAnonymous_SubscriptionListener() {
         // FIXME: try to enable for React Native
         if (!isNodeProccess) {