diff --git a/src/mame/includes/mcr.h b/src/mame/includes/mcr.h
index 6d8734c1a6d..46fd4ee098e 100644
--- a/src/mame/includes/mcr.h
+++ b/src/mame/includes/mcr.h
@@ -22,7 +22,7 @@ extern attotime mcr68_timing_factor;
 
 extern const struct z80_irq_daisy_chain mcr_daisy_chain[];
 extern const struct z80_irq_daisy_chain mcr_ipu_daisy_chain[];
-extern const z80pio_interface nflfoot_pio_intf;
+extern const struct z80pio_interface nflfoot_pio_intf;
 extern UINT8 mcr_cocktail_flip;
 
 extern const gfx_layout mcr_bg_layout;