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-rw-r--r--src/mame/machine/system16.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/machine/system16.c b/src/mame/machine/system16.c
index d4d315bda77..a457640fdfa 100644
--- a/src/mame/machine/system16.c
+++ b/src/mame/machine/system16.c
@@ -59,7 +59,7 @@ static void sound_cause_nmi( int chip ){
}
-struct upd7759_interface sys16_upd7759_interface =
+const struct upd7759_interface sys16_upd7759_interface =
{
0, /* memory region 3 contains the sample data */
sound_cause_nmi