diff --git a/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_parameter b/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_parameter
index 5888b03..51e4fb4 100644
--- a/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_parameter
+++ b/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_parameter
@@ -4,7 +4,7 @@ rcl_interfaces::msg::ParameterDescriptor descriptor;
 descriptor.description = {{parameter_description | valid_string_cpp}};
 descriptor.read_only = {{parameter_read_only}};
 {%- if parameter_additional_constraints|length %}
-descriptor.additional_constraints = "{{parameter_additional_constraints | valid_string_cpp}}";
+descriptor.additional_constraints = {{parameter_additional_constraints | valid_string_cpp}};
 {% endif -%}
 {%- for validation in parameter_validations if ("bounds" in validation.function_name or "lt" in validation.function_name or "gt" in validation.function_name) %}
 {%- if "DOUBLE" in parameter_type %}
diff --git a/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_runtime_parameter b/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_runtime_parameter
index ce1161e..625a842 100644
--- a/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_runtime_parameter
+++ b/generate_parameter_library_py/generate_parameter_library_py/jinja_templates/cpp/declare_runtime_parameter
@@ -20,7 +20,7 @@ rcl_interfaces::msg::ParameterDescriptor descriptor;
 descriptor.description = {{parameter_description | valid_string_cpp}};
 descriptor.read_only = {{parameter_read_only}};
 {%- if parameter_additional_constraints|length %}
-descriptor.additional_constraints = "{{parameter_additional_constraints | valid_string_cpp}}";
+descriptor.additional_constraints = {{parameter_additional_constraints | valid_string_cpp}};
 {% endif -%}
 {%- for validation in parameter_validations if ("bounds" in validation.function_name or "lt" in validation.function_name or "gt" in validation.function_name) %}
 {%- if "DOUBLE" in parameter_type %}