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-rw-r--r--src/cargotype.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cargotype.h b/src/cargotype.h
index 22c1bf7f5..54d24f1d7 100644
--- a/src/cargotype.h
+++ b/src/cargotype.h
@@ -23,7 +23,7 @@
typedef uint32 CargoLabel;
/** Town growth effect when delivering cargo. */
-enum TownEffect {
+enum TownEffect : byte {
TE_BEGIN = 0,
TE_NONE = TE_BEGIN, ///< Cargo has no effect.
TE_PASSENGERS, ///< Cargo behaves passenger-like.