diff --git a/packages/backend/src/apps/invoice-ninja/common/set-base-url.ts b/packages/backend/src/apps/invoice-ninja/common/set-base-url.ts
new file mode 100644
index 00000000..8bf8cd9e
--- /dev/null
+++ b/packages/backend/src/apps/invoice-ninja/common/set-base-url.ts
@@ -0,0 +1,13 @@
+import { TBeforeRequest } from '@automatisch/types';
+
+const setBaseUrl: TBeforeRequest = ($, requestConfig) => {
+  const instanceUrl = $.auth.data.instanceUrl as string;
+
+  if (instanceUrl) {
+    requestConfig.baseURL = instanceUrl;
+  }
+
+  return requestConfig;
+};
+
+export default setBaseUrl;
diff --git a/packages/backend/src/apps/invoice-ninja/index.ts b/packages/backend/src/apps/invoice-ninja/index.ts
index 7198b4dc..ed4e0a33 100644
--- a/packages/backend/src/apps/invoice-ninja/index.ts
+++ b/packages/backend/src/apps/invoice-ninja/index.ts
@@ -1,4 +1,5 @@
 import defineApp from '../../helpers/define-app';
+import setBaseUrl from './common/set-base-url';
 import addAuthHeader from './common/add-auth-header';
 import auth from './auth';
 import triggers from './triggers';
@@ -13,7 +14,7 @@ export default defineApp({
   authDocUrl: 'https://automatisch.io/docs/apps/invoice-ninja/connection',
   primaryColor: '000000',
   supportsConnections: true,
-  beforeRequest: [addAuthHeader],
+  beforeRequest: [setBaseUrl, addAuthHeader],
   auth,
   triggers,
   actions,