diff --git a/exec.c b/exec.c
index a437523..f9a4995 100644
--- a/exec.c
+++ b/exec.c
@@ -241,12 +241,12 @@ int macarg(char *tok)
  * nextarg:
  *	get the next argument
  *
- * char *prompt;		prompt to use if we must be interactive
+ * const char *prompt;		prompt to use if we must be interactive
  * char *buffer;		buffer to put token into
  * int size;			size of the buffer
  * int terminator;		terminating char to be used on interactive fetch
  */
-int nextarg(char *prompt, char *buffer, int size, int terminator)
+int nextarg(const char *prompt, char *buffer, int size, int terminator)
 {
 	/* if we are interactive, go get it! */
 	if (clexec == FALSE)
diff --git a/exec.h b/exec.h
index e0b8082..27f6b11 100644
--- a/exec.h
+++ b/exec.h
@@ -8,7 +8,7 @@ int execcmd( int f, int n) ;
 int docmd( char *cline) ;
 char *token( char *src, char *tok, int size) ;
 int macarg( char *tok) ;
-int nextarg( char *prompt, char *buffer, int size, int terminator) ;
+int nextarg( const char *prompt, char *buffer, int size, int terminator) ;
 int storemac( int f, int n) ;
 int storeproc( int f, int n) ;
 int execproc( int f, int n) ;
diff --git a/input.c b/input.c
index 1bd797d..0cc3b72 100644
--- a/input.c
+++ b/input.c
@@ -37,7 +37,7 @@
  * ABORT. The ABORT status is returned if the user bumps out of the question
  * with a ^G. Used any time a confirmation is required.
  */
-int mlyesno(char *prompt)
+int mlyesno( const char *prompt)
 {
 	char c;			/* input character */
 	char buf[NPAT];		/* prompt to user */
@@ -70,12 +70,12 @@ int mlyesno(char *prompt)
  * return. Handle erase, kill, and abort keys.
  */
 
-int mlreply(char *prompt, char *buf, int nbuf)
+int mlreply( const char *prompt, char *buf, int nbuf)
 {
 	return nextarg(prompt, buf, nbuf, ctoec('\n'));
 }
 
-int mlreplyt(char *prompt, char *buf, int nbuf, int eolchar)
+int mlreplyt(const char *prompt, char *buf, int nbuf, int eolchar)
 {
 	return nextarg(prompt, buf, nbuf, eolchar);
 }
@@ -444,11 +444,11 @@ handle_CSI:
 	to specify the proper terminator. If the terminator is not
 	a return ('\n') it will echo as "<NL>"
 							*/
-int getstring(char *prompt, char *buf, int nbuf, int eolchar)
+int getstring( const char *prompt, char *buf, int nbuf, int eolchar)
 {
 	int cpos;	/* current character position in string */
 	int c;
-	int quotef;	/* are we quoting the next char? */
+	boolean quotef ;	/* are we quoting the next char? */
 #if	COMPLC
 	int ffile, ocpos, nskip = 0, didtry = 0;
 #if     MSDOS
diff --git a/input.h b/input.h
index a1da651..99ee8db 100644
--- a/input.h
+++ b/input.h
@@ -3,16 +3,16 @@
 
 #include "edef.h"
 
-int mlyesno( char *prompt) ;
-int mlreply( char *prompt, char *buf, int nbuf) ;
-int mlreplyt( char *prompt, char *buf, int nbuf, int eolchar) ;
+int mlyesno( const char *prompt) ;
+int mlreply( const char *prompt, char *buf, int nbuf) ;
+int mlreplyt( const char *prompt, char *buf, int nbuf, int eolchar) ;
 int ectoc( int c) ;
 int ctoec( int c) ;
 fn_t getname( void) ;
 int tgetc( void) ;
 int get1key( void) ;
 int getcmd( void) ;
-int getstring( char *prompt, char *buf, int nbuf, int eolchar) ;
+int getstring( const char *prompt, char *buf, int nbuf, int eolchar) ;
 void outstring( char *s) ;
 void ostring( char *s) ;