diff --git a/unittest/force-styles/test_config.h b/unittest/force-styles/test_config.h
index ef4d911b60..18b4b4f0b2 100644
--- a/unittest/force-styles/test_config.h
+++ b/unittest/force-styles/test_config.h
@@ -15,8 +15,8 @@
 #define TEST_CONFIG_H
 
 #include <set>
-#include <string>
 #include <sstream>
+#include <string>
 #include <utility>
 #include <vector>
 
@@ -96,23 +96,21 @@ public:
         restart_vel.clear();
         global_vector.clear();
     }
-    virtual ~TestConfig(){};
+    TestConfig(const TestConfig &) = delete;
+    TestConfig &operator=(const TestConfig &) = delete;
 
     std::string tags_line() const
     {
-      if(tags.size() > 0) {
-          std::stringstream line;
-          line << tags[0];
-          for(size_t i = 1; i < tags.size(); i++) {
-            line << ", " << tags[i];
-          }
-          return line.str();
-      }
-      return "generated";
+        if (tags.size() > 0) {
+            std::stringstream line;
+            line << tags[0];
+            for (size_t i = 1; i < tags.size(); i++) {
+                line << ", " << tags[i];
+            }
+            return line.str();
+        }
+        return "generated";
     }
-
-private:
-    TestConfig(const TestConfig &){};
 };
 
 #endif
diff --git a/unittest/force-styles/test_config_reader.h b/unittest/force-styles/test_config_reader.h
index 1f0de8df0a..23da817622 100644
--- a/unittest/force-styles/test_config_reader.h
+++ b/unittest/force-styles/test_config_reader.h
@@ -22,6 +22,8 @@ class TestConfigReader : public YamlReader<TestConfigReader> {
 
 public:
     TestConfigReader(TestConfig &config);
+    TestConfigReader() = delete;
+    const TestConfigReader & operator=(TestConfig &) = delete;
 
     void skip_tests(const yaml_event_t &event);
     void prerequisites(const yaml_event_t &event);
diff --git a/unittest/force-styles/yaml_writer.h b/unittest/force-styles/yaml_writer.h
index 31df8eb60d..ca95a578c1 100644
--- a/unittest/force-styles/yaml_writer.h
+++ b/unittest/force-styles/yaml_writer.h
@@ -22,6 +22,9 @@ class YamlWriter {
 public:
     YamlWriter(const char *outfile);
     virtual ~YamlWriter();
+    YamlWriter() = delete;
+    YamlWriter(const YamlWriter &) = delete;
+    const YamlWriter & operator=(const YamlWriter &) = delete;
 
     // emitters
     void emit(const std::string &key, const double value);
@@ -34,10 +37,6 @@ private:
     FILE *fp;
     yaml_emitter_t emitter;
     yaml_event_t event;
-
-private:
-    YamlWriter(){};
-    YamlWriter(const YamlWriter &){};
 };
 
 #endif