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-rw-r--r--src/mame/includes/cps1.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/includes/cps1.h b/src/mame/includes/cps1.h
index 6eb87a3fe06..3c03805a19f 100644
--- a/src/mame/includes/cps1.h
+++ b/src/mame/includes/cps1.h
@@ -14,7 +14,7 @@ WRITE16_HANDLER( cps1_eeprom_port_w );
INTERRUPT_GEN( cps1_qsound_interrupt );
-extern struct QSound_interface qsound_interface;
+extern const struct QSound_interface qsound_interface;
READ16_HANDLER( cps1_dsw_r );
READ16_HANDLER( cps1_in0_r );