diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index b9e110639a..40e074da50 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -6195,12 +6195,10 @@ static void GRFLoadError(ByteReader *buf)
 	}
 
 	/* Only two parameter numbers can be used in the string. */
-	uint i = 0;
-	for (; i < 2 && buf->HasData(); i++) {
+	for (uint i = 0; i < lengthof(error->param_value) && buf->HasData(); i++) {
 		uint param_number = buf->ReadByte();
 		error->param_value[i] = _cur.grffile->GetParam(param_number);
 	}
-	error->num_params = i;
 
 	_cur.grfconfig->error = error;
 }
diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index 9ce75b679d..f644315f1b 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -188,8 +188,7 @@ GRFError::GRFError(const GRFError &error) :
 	custom_message(error.custom_message),
 	data(error.data),
 	message(error.message),
-	severity(error.severity),
-	num_params(error.num_params)
+	severity(error.severity)
 {
 	if (error.custom_message != NULL) this->custom_message = strdup(error.custom_message);
 	if (error.data           != NULL) this->data           = strdup(error.data);
diff --git a/src/newgrf_config.h b/src/newgrf_config.h
index 432f6679d4..a7c7da2ad6 100644
--- a/src/newgrf_config.h
+++ b/src/newgrf_config.h
@@ -107,7 +107,6 @@ struct GRFError : ZeroedMemoryAllocator {
 	char *data;            ///< Additional data for message and custom_message
 	StringID message;      ///< Default message
 	StringID severity;     ///< Info / Warning / Error / Fatal
-	uint8 num_params;      ///< Number of additinal parameters for message and custom_message (0, 1 or 2)
 	uint32 param_value[2]; ///< Values of GRF parameters to show for message and custom_message
 };
 
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index debda89659..ed3dbe6cc5 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -50,7 +50,7 @@ void ShowNewGRFError()
 		SetDParamStr(3, c->filename);
 		SetDParam   (4, STR_JUST_RAW_STRING);
 		SetDParamStr(5, c->error->data);
-		for (uint i = 0; i < c->error->num_params; i++) {
+		for (uint i = 0; i < lengthof(c->error->param_value); i++) {
 			SetDParam(6 + i, c->error->param_value[i]);
 		}
 		ShowErrorMessage(STR_NEWGRF_ERROR_FATAL_POPUP, INVALID_STRING_ID, WL_CRITICAL);
@@ -67,7 +67,7 @@ static void ShowNewGRFInfo(const GRFConfig *c, uint x, uint y, uint right, uint
 		SetDParamStr(2, c->filename);
 		SetDParam   (3, STR_JUST_RAW_STRING);
 		SetDParamStr(4, c->error->data);
-		for (uint i = 0; i < c->error->num_params; i++) {
+		for (uint i = 0; i < lengthof(c->error->param_value); i++) {
 			SetDParam(5 + i, c->error->param_value[i]);
 		}
 		GetString(message, c->error->custom_message == NULL ? c->error->message : STR_JUST_RAW_STRING, lastof(message));