diff --git a/control/json/utils/modifier.cpp b/control/json/utils/modifier.cpp
index 2374960..501a035 100644
--- a/control/json/utils/modifier.cpp
+++ b/control/json/utils/modifier.cpp
@@ -126,7 +126,7 @@
         return value;
     }
 
-    PropertyVariantType operator()(bool val) override
+    PropertyVariantType operator()(bool) override
     {
         throw std::runtime_error{
             "Bool not allowed as a 'minus' modifier value"};
@@ -271,7 +271,7 @@
         return getDefaultValue(rangeValues.back().second, defaultValue);
     }
 
-    PropertyVariantType operator()(bool val) override
+    PropertyVariantType operator()(bool) override
     {
         throw std::runtime_error{
             "Bool not allowed as a 'less_than' modifier value"};
diff --git a/control/json/utils/modifier.hpp b/control/json/utils/modifier.hpp
index 6153279..8959203 100644
--- a/control/json/utils/modifier.hpp
+++ b/control/json/utils/modifier.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright © 2021 IBM Corporation
+ * Copyright © 2022 IBM Corporation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -55,6 +55,8 @@
      */
     struct BaseOperator
     {
+        virtual ~BaseOperator() = default;
+
         virtual PropertyVariantType operator()(double val) = 0;
 
         virtual PropertyVariantType operator()(int32_t val) = 0;