diff --git a/tests/src/unit-locale-cpp.cpp b/tests/src/unit-locale-cpp.cpp
index fa71bf9b1..358101050 100644
--- a/tests/src/unit-locale-cpp.cpp
+++ b/tests/src/unit-locale-cpp.cpp
@@ -19,60 +19,64 @@ struct ParserImpl final: public nlohmann::json_sax<json>
     bool null() override
     {
         return true;
-    };
+    }
     bool boolean(bool /*val*/) override
     {
         return true;
-    };
+    }
     bool number_integer(json::number_integer_t /*val*/) override
     {
         return true;
-    };
+    }
     bool number_unsigned(json::number_unsigned_t /*val*/) override
     {
         return true;
-    };
+    }
     bool number_float(json::number_float_t /*val*/, const json::string_t& s) override
     {
         float_string_copy = s;
         return true;
-    };
+    }
     bool string(json::string_t& /*val*/) override
     {
         return true;
-    };
+    }
     bool binary(json::binary_t& /*val*/) override
     {
         return true;
-    };
+    }
     bool start_object(std::size_t /*val*/) override
     {
         return true;
-    };
+    }
     bool key(json::string_t& /*val*/) override
     {
         return true;
-    };
+    }
     bool end_object() override
     {
         return true;
-    };
+    }
     bool start_array(std::size_t /*val*/) override
     {
         return true;
-    };
+    }
     bool end_array() override
     {
         return true;
-    };
+    }
     bool parse_error(std::size_t /*val*/, const std::string& /*val*/, const nlohmann::detail::exception& /*val*/) override
     {
         return false;
-    };
+    }
+
+    ~ParserImpl() override;
 
     json::string_t float_string_copy;
 };
 
+ParserImpl::~ParserImpl() = default;
+
 TEST_CASE("locale-dependent test (LC_NUMERIC=C")
 {
     if (std::setlocale(LC_NUMERIC, "C") == nullptr)