diff --git a/cmk/update_config/http/migrate.py b/cmk/update_config/http/migrate.py
index 09d2c59e02b..d43b766b852 100644
--- a/cmk/update_config/http/migrate.py
+++ b/cmk/update_config/http/migrate.py
@@ -143,6 +143,8 @@ def _migrate_url_params(
     return (
         {
             **method,  # TODO: Proxy sets this to CONNECT.
+            "http_versions": "http_1_1",  # TODO: This preserves behaviour, v1 only allows for HTTP/1.1. or HTTP/1.0.
+            # However, for most customers this still might be undesirable.
             **tls_versions,
             **timeout,
             **user_agent,
diff --git a/tests/unit/cmk/update_config/http/test_migrate.py b/tests/unit/cmk/update_config/http/test_migrate.py
index c3c9c40f87e..7cfe7e0c029 100644
--- a/tests/unit/cmk/update_config/http/test_migrate.py
+++ b/tests/unit/cmk/update_config/http/test_migrate.py
@@ -1464,3 +1464,13 @@ def test_migrate_address_family(rule_value: Mapping[str, object], expected: obje
     # Assert
     assert ssc_value[0].settings.connection is not None
     assert ssc_value[0].settings.connection.address_family == expected
+
+
+def test_preserve_http_version() -> None:
+    # Act
+    migrated = migrate(EXAMPLE_27)
+    # Assemble
+    ssc_value = parse_http_params(process_configuration_to_parameters(migrated).value)
+    # Assert
+    assert ssc_value[0].settings.connection is not None
+    assert ssc_value[0].settings.connection.http_versions == "http_1_1"