diff --git a/src/viewport.cpp b/src/viewport.cpp
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -2363,7 +2363,7 @@ bool HandleViewportClicked(const Viewpor
 	bool result = CheckClickOnLandscape(vp, x, y);
 
 	if (v != nullptr) {
-		DEBUG(misc, 2, "Vehicle %d (index %d) at %p", v->unitnumber, v->index, v);
+		Debug(misc, 2, "Vehicle {} (index {}) at {}", v->unitnumber, v->index, fmt::ptr(v));
 		if (IsCompanyBuildableVehicleType(v)) {
 			v = v->First();
 			if (_ctrl_pressed && v->owner == _local_company) {