diff --git a/dlt/common/configuration/specs/gcp_credentials.py b/dlt/common/configuration/specs/gcp_credentials.py
index 21ae2587ed..17519b032a 100644
--- a/dlt/common/configuration/specs/gcp_credentials.py
+++ b/dlt/common/configuration/specs/gcp_credentials.py
@@ -356,3 +356,9 @@ def parse_native_representation(self, native_value: Any) -> None:
         except NativeValueError:
             pass
         GcpOAuthCredentialsWithoutDefaults.parse_native_representation(self, native_value)
+
+    def to_pyiceberg_fileio_config(self) -> Dict[str, Any]:
+        if self.has_default_credentials():
+            return GcpDefaultCredentials.to_pyiceberg_fileio_config(self)
+        else:
+            return GcpOAuthCredentialsWithoutDefaults.to_pyiceberg_fileio_config(self)
diff --git a/tests/load/utils.py b/tests/load/utils.py
index 7835927f5c..5660202ec3 100644
--- a/tests/load/utils.py
+++ b/tests/load/utils.py
@@ -636,14 +636,7 @@ def destinations_configs(
                     table_format="iceberg",
                     supports_merge=False,
                     file_format="parquet",
-                    credentials=(
-                        resolve_configuration(
-                            GcpOAuthCredentialsWithoutDefaults(),
-                            sections=("destination", "fsgcpoauth"),
-                        )
-                        if bucket == GCS_BUCKET
-                        else None
-                    ),
+                    destination_name="fsgcpoauth" if bucket == GCS_BUCKET else None,
                 )
             ]