diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -176,7 +176,7 @@ void BaseVehicleListWindow::BuildVehicle
 {
 	if (!this->vehgroups.NeedRebuild()) return;
 
-	DEBUG(misc, 3, "Building vehicle list type %d for company %d given index %d", this->vli.type, this->vli.company, this->vli.index);
+	Debug(misc, 3, "Building vehicle list type {} for company {} given index {}", this->vli.type, this->vli.company, this->vli.index);
 
 	this->vehgroups.clear();
 
@@ -1906,7 +1906,7 @@ public:
 		if (this->vehgroups.NeedResort()) {
 			StationID station = (this->vli.type == VL_STATION_LIST) ? this->vli.index : INVALID_STATION;
 
-			DEBUG(misc, 3, "Periodic resort %d list company %d at station %d", this->vli.vtype, this->owner, station);
+			Debug(misc, 3, "Periodic resort {} list company {} at station {}", this->vli.vtype, this->owner, station);
 			this->SetDirty();
 		}
 	}