diff --git a/pygeoapi/api/environmental_data_retrieval.py b/pygeoapi/api/environmental_data_retrieval.py
index 64ec4e0..494e695 100644
--- a/pygeoapi/api/environmental_data_retrieval.py
+++ b/pygeoapi/api/environmental_data_retrieval.py
@@ -101,8 +101,8 @@ def get_collection_edr_query(api: API, request: APIRequest,
             HTTPStatus.BAD_REQUEST, headers, request.format,
             'InvalidParameterValue', msg)
 
-    LOGGER.debug('Processing parameter_names parameter')
-    parameternames = request.params.get('parameter_names') or []
+    LOGGER.debug('Processing parameter-name parameter')
+    parameternames = request.params.get('parameter-name') or []
     if isinstance(parameternames, str):
         parameternames = parameternames.split(',')
 
@@ -167,7 +167,7 @@ def get_collection_edr_query(api: API, request: APIRequest,
 
     if parameternames and not any((fld in parameternames)
                                   for fld in p.get_fields().keys()):
-        msg = 'Invalid parameter_names'
+        msg = 'Invalid parameter-name'
         return api.get_exception(
             HTTPStatus.BAD_REQUEST, headers, request.format,
             'InvalidParameterValue', msg)
diff --git a/tests/api/test_environmental_data_retrieval.py b/tests/api/test_environmental_data_retrieval.py
index 0de57f0..35abed7 100644
--- a/tests/api/test_environmental_data_retrieval.py
+++ b/tests/api/test_environmental_data_retrieval.py
@@ -67,9 +67,9 @@ def test_get_collection_edr_query(config, api_):
         api_, req, 'icoads-sst', None, 'position')
     assert code == HTTPStatus.BAD_REQUEST
 
-    # bad parameter_names parameter
+    # bad parameter-name parameter
     req = mock_api_request({
-        'coords': 'POINT(11 11)', 'parameter_names': 'bad'
+        'coords': 'POINT(11 11)', 'parameter-name': 'bad'
     })
     rsp_headers, code, response = get_collection_edr_query(
         api_, req, 'icoads-sst', None, 'position')
@@ -100,7 +100,7 @@ def test_get_collection_edr_query(config, api_):
 
     # single parameter
     req = mock_api_request({
-        'coords': 'POINT(11 11)', 'parameter_names': 'SST'
+        'coords': 'POINT(11 11)', 'parameter-name': 'SST'
     })
     rsp_headers, code, response = get_collection_edr_query(
         api_, req, 'icoads-sst', None, 'position')
@@ -217,7 +217,7 @@ def test_get_collection_edr_query(config, api_):
     # cube decreasing latitude coords and S3
     req = mock_api_request({
         'bbox': '-100,40,-99,45',
-        'parameter_names': 'tmn',
+        'parameter-name': 'tmn',
         'datetime': '1994-01-01/1994-12-31',
     })