diff --git a/senza/components/elastic_load_balancer.py b/senza/components/elastic_load_balancer.py
index fcaff24..74c10c5 100644
--- a/senza/components/elastic_load_balancer.py
+++ b/senza/components/elastic_load_balancer.py
@@ -164,6 +164,7 @@ def component_elastic_load_balancer(definition,
     definition["Resources"][lb_name] = {
         "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
         "Properties": {
+            "Scheme": loadbalancer_scheme,
             "Subnets": {"Fn::FindInMap": [loadbalancer_subnet_map, {"Ref": "AWS::Region"}, "Subnets"]},
             "HealthCheck": {
                 "HealthyThreshold": "2",

ELB should have Scheme "internal" if "Scheme" is not defined
The ELB "Scheme" property should default to "internal" if it's not set.
diff --git a/tests/test_components.py b/tests/test_components.py
index 207fca2..651b318 100644
--- a/tests/test_components.py
+++ b/tests/test_components.py
@@ -13,6 +13,7 @@ from senza.components.auto_scaling_group import (component_auto_scaling_group,
                                                  to_iso8601_duration)
 from senza.components.elastic_load_balancer import (component_elastic_load_balancer,
                                                     get_load_balancer_name)
+from senza.components.elastic_load_balancer_v2 import component_elastic_load_balancer_v2
 from senza.components.iam_role import component_iam_role, get_merged_policies
 from senza.components.redis_cluster import component_redis_cluster
 from senza.components.redis_node import component_redis_node
@@ -976,3 +977,43 @@ def test_max_description_length():
     component_configuration(definition, configuration, args, info, False, AccountArguments('dummyregion'))
     assert definition['Description'].startswith('My Stack (Param1: my param value, SecondParam: 1234567890')
     assert 0 < len(definition['Description']) <= 1024
+
+
+def test_component_load_balancer_default_internal_scheme(monkeypatch):
+    configuration = {
+        "Name": "test_lb",
+        "SecurityGroups": "",
+        "HTTPPort": "9999"
+    }
+    info = {'StackName': 'foobar', 'StackVersion': '0.1'}
+    definition = {"Resources": {}}
+
+    args = MagicMock()
+    args.region = "foo"
+
+    mock_string_result = MagicMock()
+    mock_string_result.return_value = "foo"
+    monkeypatch.setattr('senza.components.elastic_load_balancer.resolve_security_groups', mock_string_result)
+
+    result = component_elastic_load_balancer(definition, configuration, args, info, False, MagicMock())
+    assert 'internal' == result["Resources"]["test_lb"]["Properties"]["Scheme"]
+
+
+def test_component_load_balancer_v2_default_internal_scheme(monkeypatch):
+    configuration = {
+        "Name": "test_lb",
+        "SecurityGroups": "",
+        "HTTPPort": "9999"
+    }
+    info = {'StackName': 'foobar', 'StackVersion': '0.1'}
+    definition = {"Resources": {}}
+
+    args = MagicMock()
+    args.region = "foo"
+
+    mock_string_result = MagicMock()
+    mock_string_result.return_value = "foo"
+    monkeypatch.setattr('senza.components.elastic_load_balancer_v2.resolve_security_groups', mock_string_result)
+
+    result = component_elastic_load_balancer_v2(definition, configuration, args, info, False, MagicMock())
+    assert 'internal' == result["Resources"]["test_lb"]["Properties"]["Scheme"]

pip install -e .[dev]
parse_log_pytest
requirements.txt
pytest pytest-cov
apt-get update apt-get install -y gcc
3.9
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
boto3==1.37.23
botocore==1.37.23
certifi==2025.1.31
charset-normalizer==3.4.1
click==8.1.8
clickclick==20.10.2
coverage==7.8.0
dnspython==1.15.0
dnspython3==1.15.0
exceptiongroup==1.2.2
idna==3.10
importlib_metadata==8.6.1
iniconfig==2.1.0
jmespath==1.0.1
packaging==24.2
pluggy==1.5.0
pystache==0.6.8
pytest==8.3.5
pytest-cov==6.0.0
python-dateutil==2.9.0.post0
PyYAML==6.0.2
requests==2.32.3
s3transfer==0.11.4
six==1.17.0
stups-cli-support==1.1.22
stups-pierone==1.1.56
-e git+https://github.com/zalando-stups/senza.git@0429d0ed3bd768baa43b7bd595e08c5aed44bfc8#egg=stups_senza
stups-tokens==1.1.19
stups-zign==1.2
tomli==2.2.1
typing==3.7.4.3
urllib3==1.26.20
zipp==3.21.0

name: senza
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=3.0.16=h5eee18b_0
  - pip=25.0=py39h06a4308_0
  - python=3.9.21=he870216_1
  - readline=8.2=h5eee18b_0
  - setuptools=75.8.0=py39h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - tzdata=2025a=h04d1e81_0
  - wheel=0.45.1=py39h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - boto3==1.37.23
      - botocore==1.37.23
      - certifi==2025.1.31
      - charset-normalizer==3.4.1
      - click==8.1.8
      - clickclick==20.10.2
      - coverage==7.8.0
      - dnspython==1.15.0
      - dnspython3==1.15.0
      - exceptiongroup==1.2.2
      - idna==3.10
      - importlib-metadata==8.6.1
      - iniconfig==2.1.0
      - jmespath==1.0.1
      - packaging==24.2
      - pluggy==1.5.0
      - pystache==0.6.8
      - pytest==8.3.5
      - pytest-cov==6.0.0
      - python-dateutil==2.9.0.post0
      - pyyaml==6.0.2
      - requests==2.32.3
      - s3transfer==0.11.4
      - six==1.17.0
      - stups-cli-support==1.1.22
      - stups-pierone==1.1.56
      - stups-tokens==1.1.19
      - stups-zign==1.2
      - tomli==2.2.1
      - typing==3.7.4.3
      - urllib3==1.26.20
      - zipp==3.21.0
prefix: /opt/conda/envs/senza

tests/test_components.py::test_component_load_balancer_default_internal_scheme
tests/test_components.py::test_weighted_dns_load_balancer tests/test_components.py::test_weighted_dns_load_balancer_with_different_domains tests/test_components.py::test_check_docker_image_exists
tests/test_components.py::test_invalid_component tests/test_components.py::test_component_iam_role tests/test_components.py::test_get_merged_policies tests/test_components.py::test_component_load_balancer_healthcheck tests/test_components.py::test_component_load_balancer_idletimeout tests/test_components.py::test_component_load_balancer_cert_arn tests/test_components.py::test_component_load_balancer_http_only tests/test_components.py::test_component_load_balancer_namelength tests/test_components.py::test_component_stups_auto_configuration tests/test_components.py::test_component_stups_auto_configuration_vpc_id tests/test_components.py::test_component_redis_node tests/test_components.py::test_component_redis_cluster tests/test_components.py::test_component_taupage_auto_scaling_group_user_data_without_ref tests/test_components.py::test_component_taupage_auto_scaling_group_user_data_with_ref tests/test_components.py::test_component_taupage_auto_scaling_group_user_data_with_lists_and_empty_dict tests/test_components.py::test_component_auto_scaling_group_configurable_properties tests/test_components.py::test_component_auto_scaling_group_custom_tags tests/test_components.py::test_component_auto_scaling_group_configurable_properties2 tests/test_components.py::test_component_auto_scaling_group_metric_type tests/test_components.py::test_component_auto_scaling_group_optional_metric_type tests/test_components.py::test_to_iso8601_duration tests/test_components.py::test_normalize_asg_success tests/test_components.py::test_normalize_network_threshold tests/test_components.py::test_check_application_id tests/test_components.py::test_check_application_version tests/test_components.py::test_get_load_balancer_name tests/test_components.py::test_weighted_dns_load_balancer_v2 tests/test_components.py::test_max_description_length tests/test_components.py::test_component_load_balancer_v2_default_internal_scheme
senza/components/elastic_load_balancer.py
senza/components/elastic_load_balancer.py