1 files changed, 2 insertions, 0 deletions
diff --git a/src/cargotype.h b/src/cargotype.h
index 65a5797cf..684e463ab 100644
--- a/src/cargotype.h
+++ b/src/cargotype.h
@@ -31,6 +31,8 @@ typedef struct CargoSpec {
 	SpriteID sprite;
 
 	uint16 classes;
+
+	bool IsValid() const;
 } CargoSpec;