diff --git a/src/superio/winbond/w83697hf/early_serial.c b/src/superio/winbond/w83697hf/early_serial.c
index 7731804699..2825eebd23 100644
--- a/src/superio/winbond/w83697hf/early_serial.c
+++ b/src/superio/winbond/w83697hf/early_serial.c
@@ -35,7 +35,7 @@ static void pnp_exit_ext_func_mode(device_t dev)
 	outb(0xaa, port);
 }
 
-static void w83697hf_set_clksel_48(device_t dev)
+void w83697hf_set_clksel_48(device_t dev)
 {
 	u8 reg8;
 
diff --git a/src/superio/winbond/w83697hf/w83697hf.h b/src/superio/winbond/w83697hf/w83697hf.h
index 0eeb37c9c9..6488dd3925 100644
--- a/src/superio/winbond/w83697hf/w83697hf.h
+++ b/src/superio/winbond/w83697hf/w83697hf.h
@@ -32,4 +32,8 @@
 #define W83697HF_ACPI           10   /* ACPI */
 #define W83697HF_HWM            11   /* Hardware monitor */
 
+#ifndef __ROMCC__
+void w83697hf_set_clksel_48(device_t);
+#endif
+
 #endif