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-rw-r--r--src/mame/machine/namcoio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/machine/namcoio.c b/src/mame/machine/namcoio.c
index 38e135ccefc..5f6c3fe7748 100644
--- a/src/mame/machine/namcoio.c
+++ b/src/mame/machine/namcoio.c
@@ -277,7 +277,7 @@ static void namcoio_51XX_write(int chip,int data)
verified on Namco original hardware, but they are the same in all the bootlegs,
so we can assume they are right.
*/
-static int joy_map[16] =
+static const int joy_map[16] =
/* LDRU, LDR, LDU, LD, LRU, LR, LU, L, DRU, DR, DU, D, RU, R, U, center */
{ 0xf, 0xe, 0xd, 0x5, 0xc, 0x9, 0x7, 0x6, 0xb, 0x3, 0xa, 0x4, 0x1, 0x2, 0x0, 0x8 };