diff --git a/src/newgrf_object.cpp b/src/newgrf_object.cpp
--- a/src/newgrf_object.cpp
+++ b/src/newgrf_object.cpp
@@ -335,7 +335,7 @@ static uint32 GetCountAndDistanceOfClose
 	}
 
 unhandled:
-	DEBUG(grf, 1, "Unhandled object variable 0x%X", variable);
+	Debug(grf, 1, "Unhandled object variable 0x{:X}", variable);
 
 	*available = false;
 	return UINT_MAX;