diff --git a/src/superio/nuvoton/nct5104d/Makefile.inc b/src/superio/nuvoton/nct5104d/Makefile.inc
index b9345aa18d..7c97d059d5 100644
--- a/src/superio/nuvoton/nct5104d/Makefile.inc
+++ b/src/superio/nuvoton/nct5104d/Makefile.inc
@@ -20,4 +20,3 @@
 
 romstage-$(CONFIG_SUPERIO_NUVOTON_NCT5104D) += early_init.c
 ramstage-$(CONFIG_SUPERIO_NUVOTON_NCT5104D) += superio.c
-
diff --git a/src/superio/nuvoton/nct5104d/early_init.c b/src/superio/nuvoton/nct5104d/early_init.c
index 9c0cf0fad4..f3d8990fed 100644
--- a/src/superio/nuvoton/nct5104d/early_init.c
+++ b/src/superio/nuvoton/nct5104d/early_init.c
@@ -19,8 +19,7 @@
  */
 
 #include <arch/io.h>
-#include <arch/romcc_io.h>
-#include <device/pnp_def.h>
+#include <device/pnp.h>
 #include "nct5104d.h"
 
 static void pnp_enter_extended_mode(device_t dev)
@@ -36,7 +35,7 @@ static void pnp_exit_extended_mode(device_t dev)
 	outb(0xaa,port);
 }
 
-static void nct5104d_enable_serial(device_t dev, u16 iobase)
+void nct5104d_enable_serial(device_t dev, u16 iobase)
 {
 	pnp_enter_extended_mode(dev);
 	pnp_set_logical_device(dev);
diff --git a/src/superio/nuvoton/nct5104d/nct5104d.h b/src/superio/nuvoton/nct5104d/nct5104d.h
index 2f833afde9..98baf810e5 100644
--- a/src/superio/nuvoton/nct5104d/nct5104d.h
+++ b/src/superio/nuvoton/nct5104d/nct5104d.h
@@ -37,4 +37,6 @@
 #define NCT5104D_GPIO1 ((1 << 8) | NCT5104D_GPIO_V)
 #define NCT5104D_GPIO6 ((6 << 8) | NCT5104D_GPIO_V)
 
-#endif
+void nct5104d_enable_serial(device_t dev, u16 iobase);
+
+#endif /* SUPERIO_NUVOTON_NCT5104D_NCT5104D_H */