diff --git a/src/model/script_config.py b/src/model/script_config.py
index 677d23d2..debbb358 100644
--- a/src/model/script_config.py
+++ b/src/model/script_config.py
@@ -122,7 +122,11 @@ def get_sort_key(parameter):
                 if required_parameters and any(r not in processed for r in required_parameters):
                     continue
 
-                value = parameter.normalize_user_value(param_values.get(parameter.name))
+                if parameter.constant:
+                    value = parameter.default
+                else:
+                    value = parameter.normalize_user_value(param_values.get(parameter.name))
+
                 validation_error = parameter.validate_value(value)
                 if validation_error:
                     if skip_invalid_parameters:
diff --git a/src/tests/script_config_test.py b/src/tests/script_config_test.py
index fd6fd585..b38079fa 100644
--- a/src/tests/script_config_test.py
+++ b/src/tests/script_config_test.py
@@ -479,6 +479,21 @@ def test_set_all_values_for_included(self):
 
         self.assertEqual(values, config_model.parameter_values)
 
+    def test_set_all_values_for_dependant_on_constant(self):
+        included_path = test_utils.write_script_config({'parameters': [
+            create_script_param_config('included_param1', values_script='echo ${p1}'),
+        ]}, 'included')
+        config_model = _create_config_model(
+            'main_conf',
+            config={
+                'include': included_path,
+                'parameters': [create_script_param_config('p1', constant=True, default='t1\nt2\nt3')]})
+
+        values = {'included_param1': 't2'}
+        config_model.set_all_param_values(values)
+
+        self.assertEqual({'included_param1': 't2', 'p1': 't1\nt2\nt3'}, config_model.parameter_values)
+
     def test_dynamic_include_add_parameter_with_default(self):
         (config_model, included_path) = self.prepare_config_model_with_included([
             create_script_param_config('included_param', default='abc 123')
@@ -853,21 +868,20 @@ def test_get_sorted_with_parameters(self):
         ])
         self.assertEqual(expected, config)
 
-
     def test_json_comments(self):
         config = get_sorted_config(custom_json.loads(
-                """{
-                // Comment 1
-                "parameters": [
-                            // Comment 2
-                            {"name": "param2", "description": "desc 1"},
-                            {"type": "int", "name": "paramA"},
-                            {"default": "false", "name": "param1", "no_value": true}
-                            ],
-                // Comment 3
-                "name": "Conf X"
-                }""")
-            )
+            """{
+            // Comment 1
+            "parameters": [
+                        // Comment 2
+                        {"name": "param2", "description": "desc 1"},
+                        {"type": "int", "name": "paramA"},
+                        {"default": "false", "name": "param1", "no_value": true}
+                        ],
+            // Comment 3
+            "name": "Conf X"
+            }""")
+        )
 
         expected = OrderedDict([
             ('name', 'Conf X'),