diff --git a/gopay/payments.py b/gopay/payments.py
index 2321e08..d5b4afd 100644
--- a/gopay/payments.py
+++ b/gopay/payments.py
@@ -142,4 +142,4 @@ def find_eet_receipts_by_filter(self, filter: dict) -> Response:
 
     @property
     def get_embedjs_url(self) -> str:
-        return self.gopay.base_url[-4] + "/gp-gw/js/embed.js"
+        return self.gopay.base_url[:-4] + "/gp-gw/js/embed.js"
diff --git a/tests/test_payments.py b/tests/test_payments.py
index 836e7b3..d6232e8 100644
--- a/tests/test_payments.py
+++ b/tests/test_payments.py
@@ -81,3 +81,6 @@ def test_with_services(
         assert payments.gopay.api_client.token is not None
         assert isinstance(payments.gopay.api_client.cache, MockCache)
         assert payments.gopay.api_client.logger == mock_logger
+
+    def test_embed_url(self, payments: Payments, gateway_url: str):
+        assert payments.get_embedjs_url == gateway_url[:-4] + "/gp-gw/js/embed.js"