diff --git a/src/common.h b/src/common.h
index 53e9372..9ee0c07 100644
--- a/src/common.h
+++ b/src/common.h
@@ -75,7 +75,7 @@ struct control {
 
 extern struct player_mode pmode[];
 
-int report(char *, ...);
+int report(const char *, ...);
 
 void delay_ms(int msec);
 
@@ -90,7 +90,7 @@ int reset_tty(void);
 
 /* info */
 void info_mod(struct xmp_module_info *, int);
-void info_message(char *, ...);
+void info_message(const char *, ...);
 void info_frame_init(void);
 void info_frame(struct xmp_module_info *, struct xmp_frame_info *, struct control *, int);
 void info_ins_smp(struct xmp_module_info *);
diff --git a/src/info.c b/src/info.c
index 2b67027..0257561 100644
--- a/src/info.c
+++ b/src/info.c
@@ -120,7 +120,7 @@ void info_frame_init(void)
 static int msg_timer = 0;
 static char msg_text[MSG_SIZE];
 
-void info_message(char *format, ...)
+void info_message(const char *format, ...)
 {
 	va_list ap;
 
diff --git a/src/main.c b/src/main.c
index 151c5ac..bd8d660 100644
--- a/src/main.c
+++ b/src/main.c
@@ -37,7 +37,7 @@ static unsigned int foreground_in, foreground_out;
 static int refresh_status;
 
 
-int report(char *fmt, ...)
+int report(const char *fmt, ...)
 {
 	va_list a;
 	int n;