diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 2286e34a45..49af8ccf41 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -7191,7 +7191,7 @@ static void GRFLoadError(ByteReader *buf)
 	}
 
 	/* Only two parameter numbers can be used in the string. */
-	for (uint i = 0; i < lengthof(error->param_value) && buf->HasData(); i++) {
+	for (uint i = 0; i < error->param_value.size() && buf->HasData(); i++) {
 		uint param_number = buf->ReadByte();
 		error->param_value[i] = _cur.grffile->GetParam(param_number);
 	}
diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index 235d49a73d..17b0ab6464 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -158,26 +158,10 @@ uint _missing_extra_graphics = 0;
  * @param severity The severity of this error.
  * @param message The actual error-string.
  */
-GRFError::GRFError(StringID severity, StringID message) :
-	message(message),
-	severity(severity),
-	param_value()
+GRFError::GRFError(StringID severity, StringID message) : message(message), severity(severity)
 {
 }
 
-/**
- * Create a new GRFError that is a deep copy of an existing error message.
- * @param error The GRFError object to make a copy of.
- */
-GRFError::GRFError(const GRFError &error) :
-	custom_message(error.custom_message),
-	data(error.data),
-	message(error.message),
-	severity(error.severity)
-{
-	memcpy(this->param_value, error.param_value, sizeof(this->param_value));
-}
-
 /**
  * Create a new empty GRFParameterInfo object.
  * @param nr The newgrf parameter that is changed.
diff --git a/src/newgrf_config.h b/src/newgrf_config.h
index bd8db85961..ef71e7e8d1 100644
--- a/src/newgrf_config.h
+++ b/src/newgrf_config.h
@@ -108,16 +108,12 @@ struct GRFIdentifier {
 /** Information about why GRF had problems during initialisation */
 struct GRFError {
 	GRFError(StringID severity, StringID message = 0);
-	GRFError(const GRFError &error);
-
-	/* Remove the copy assignment, as the default implementation will not do the right thing. */
-	GRFError &operator=(GRFError &rhs) = delete;
 
 	std::string custom_message; ///< Custom message (if present)
 	std::string data;           ///< Additional data for message and custom_message
 	StringID message;           ///< Default message
 	StringID severity;          ///< Info / Warning / Error / Fatal
-	uint32 param_value[2];      ///< Values of GRF parameters to show for message and custom_message
+	std::array<uint32_t, 2> param_value; ///< Values of GRF parameters to show for message and custom_message
 };
 
 /** The possible types of a newgrf parameter. */
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index da26d62f36..ba6ffa307d 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -55,7 +55,7 @@ void ShowNewGRFError()
 		SetDParamStr(2, c->error->custom_message);
 		SetDParamStr(3, c->filename);
 		SetDParamStr(4, c->error->data);
-		for (uint i = 0; i < lengthof(c->error->param_value); i++) {
+		for (uint i = 0; i < c->error->param_value.size(); i++) {
 			SetDParam(5 + i, c->error->param_value[i]);
 		}
 		if (c->error->severity == STR_NEWGRF_ERROR_MSG_FATAL) {
@@ -75,7 +75,7 @@ static void ShowNewGRFInfo(const GRFConfig *c, const Rect &r, bool show_params)
 		SetDParamStr(0, c->error->custom_message); // is skipped by built-in messages
 		SetDParamStr(1, c->filename);
 		SetDParamStr(2, c->error->data);
-		for (uint i = 0; i < lengthof(c->error->param_value); i++) {
+		for (uint i = 0; i < c->error->param_value.size(); i++) {
 			SetDParam(3 + i, c->error->param_value[i]);
 		}
 		GetString(message, c->error->message != STR_NULL ? c->error->message : STR_JUST_RAW_STRING, lastof(message));