diff --git a/srogue/pstats.c b/srogue/pstats.c
index b197c86..fc40065 100644
--- a/srogue/pstats.c
+++ b/srogue/pstats.c
@@ -21,7 +21,7 @@ int hungdam(void);
  *	Changes players hit points
  */
 void
-chg_hpt(int howmany, bool alsomax, char what)
+chg_hpt(int howmany, bool alsomax, unsigned char what)
 {
 	nochange = FALSE;
 	if(alsomax)
diff --git a/srogue/rip.c b/srogue/rip.c
index eeefc64..4337502 100644
--- a/srogue/rip.c
+++ b/srogue/rip.c
@@ -61,7 +61,7 @@ void showpack(bool winner, char *howso);
 
 #include <time.h>
 void
-death(char monst)
+death(unsigned char monst)
 {
 	reg char *killer;
 	int dp;
@@ -122,7 +122,7 @@ int oldpurse;
  *	Figure score and post it.
  */
 void
-score(int amount, int aflag, char monst)
+score(int amount, int aflag, unsigned char monst)
 {
 	reg struct sc_ent *scp, *sc2;
 	reg int i, prflags = 0;
@@ -219,7 +219,7 @@ score(int amount, int aflag, char monst)
 	showtop(prflags);		/* print top ten list */
 }
 
-void writelog(int amount, int aflag, char monst)
+void writelog(int amount, int aflag, unsigned char monst)
 {
 	char logmessage[220], ltemp[80], mlev[40];
 	char *killer;
diff --git a/srogue/rogue.ext b/srogue/rogue.ext
index f70b745..86ee05b 100644
--- a/srogue/rogue.ext
+++ b/srogue/rogue.ext
@@ -62,14 +62,14 @@ bool    cansee(int y, int x);
 char   *charge_str(struct object *obj);
 void    check_level(void);
 void    chg_abil(int what, int amt, int how);
-void    chg_hpt(int howmany, bool alsomax, char what);
+void    chg_hpt(int howmany, bool alsomax, unsigned char what);
 void    command(void);
 bool    cordok(int y, int x);
 void    create_obj(bool fscr);
 void    cur_null(struct object *op);
 void    dbotline(WINDOW *scr, char *message);
 bool    dead_end(char ch);
-void    death(char monst);
+void    death(unsigned char monst);
 void    del_pack(struct linked_list *what);
 bool    diag_ok(struct coord *sp, struct coord *ep);
 void    dip_it(void);
@@ -208,7 +208,7 @@ void    sapem(int fromfuse);
 bool    save(int which);
 bool    save_game(void);
 bool    save_throw(int which, struct thing *tp);
-void    score(int amount, int aflag, char monst);
+void    score(int amount, int aflag, unsigned char monst);
 void    sell_it(void);
 void    setoflg(struct object *what, long bit);
 void    setup(void);
@@ -244,4 +244,4 @@ void    wghtchk(int fromfuse);
 void    whatis(struct linked_list *what);
 void    wield(void);
 char    winat(int y, int x);
-void    writelog(int amount, int aflag, char monst);
+void    writelog(int amount, int aflag, unsigned char monst);