diff --git a/src/subsidy_gui.cpp b/src/subsidy_gui.cpp
--- a/src/subsidy_gui.cpp
+++ b/src/subsidy_gui.cpp
@@ -161,7 +161,7 @@ struct SubsidyListWindow : Window {
 			if (!s->IsAwarded()) {
 				if (IsInsideMM(pos, 0, cap)) {
 					/* Displays the two offered towns */
-					SetupSubsidyDecodeParam(s, true);
+					SetupSubsidyDecodeParam(s, SubsidyDecodeParamType::Gui);
 					SetDParam(7, _date - ymd.day + s->remaining * 32);
 					DrawString(x, right, y + pos * FONT_HEIGHT_NORMAL, STR_SUBSIDIES_OFFERED_FROM_TO);
 				}
@@ -184,7 +184,7 @@ struct SubsidyListWindow : Window {
 		for (const Subsidy *s : Subsidy::Iterate()) {
 			if (s->IsAwarded()) {
 				if (IsInsideMM(pos, 0, cap)) {
-					SetupSubsidyDecodeParam(s, true);
+					SetupSubsidyDecodeParam(s, SubsidyDecodeParamType::Gui);
 					SetDParam(7, s->awarded);
 					SetDParam(8, _date - ymd.day + s->remaining * 32);