diff --git a/include/creativision.h b/include/creativision.h
index 40b9ee03a..6910ee0cf 100644
--- a/include/creativision.h
+++ b/include/creativision.h
@@ -70,9 +70,9 @@
 #define COLOR_WHITE         15
 
 /* Protos */
-void __fastcall__ psg_outb(unsigned char b);
-void __fastcall__ psg_delay(unsigned char b);
-void psg_silence(void);
-void __fastcall__ bios_playsound(void *a, unsigned char b);
+void __fastcall__ psg_outb (unsigned char b);
+void __fastcall__ psg_delay (unsigned char b);
+void psg_silence (void);
+void __fastcall__ bios_playsound (const void *a, unsigned char b);
 
 #endif  /* #ifndef _CVISION_H */
diff --git a/libsrc/creativision/psg.s b/libsrc/creativision/psg.s
index a32e87f02..18f4ffe2e 100644
--- a/libsrc/creativision/psg.s
+++ b/libsrc/creativision/psg.s
@@ -1,7 +1,7 @@
-; void __fastcall__ psg_outb( unsigned char b );
-; void __fastcall__ psg_delayms( unsigned char c);
-; void __fastcall__ bios_playsound( void *b, unsigned char c);
-; void psg_silence( void );
+; void __fastcall__ psg_outb (unsigned char b);
+; void __fastcall__ psg_delay (unsigned char c);
+; void __fastcall__ bios_playsound (const void *b, unsigned char c);
+; void psg_silence (void);
 
         .export          _psg_outb, _psg_silence, _psg_delay
         .export          _bios_playsound