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-rw-r--r--src/newgrf.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 43f3382eb..42a54a15e 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -259,7 +259,7 @@ StringIDToGRFIDMapping _string_to_grf_mapping;
StringID MapGRFStringID(uint32 grfid, StringID str)
{
/* StringID table for TextIDs 0x4E->0x6D */
- static StringID units_volume[] = {
+ static const StringID units_volume[] = {
STR_NOTHING, STR_PASSENGERS, STR_TONS, STR_BAGS,
STR_LITERS, STR_ITEMS, STR_CRATES, STR_TONS,
STR_TONS, STR_TONS, STR_TONS, STR_BAGS,