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-rw-r--r--src/unmovable_map.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/unmovable_map.h b/src/unmovable_map.h
index 91782728b..0dd11e7dc 100644
--- a/src/unmovable_map.h
+++ b/src/unmovable_map.h
@@ -166,8 +166,7 @@ static inline void SetCompanyHQSection(TileIndex t, uint8 section)
static inline void EnlargeCompanyHQ(TileIndex t, byte size)
{
assert(GetCompanyHQSection(t) == 0);
-
- size++;
+ assert(size <= 4);
if (size <= GetCompanyHQSize(t)) return;
SetCompanyHQSize(t , size);