2 files changed, 2 insertions, 2 deletions
diff --git a/halibut.h b/halibut.h
index 3f5b560..5a6c8fd 100644
--- a/halibut.h
+++ b/halibut.h
@@ -275,7 +275,7 @@ void sfree(void *p);
 void free_word_list(word *w);
 void free_para_list(paragraph *p);
 word *dup_word_list(word *w);
-char *dupstr(char *s);
+char *dupstr(char const *s);
 
 #define snew(type) ( (type *) smalloc (sizeof (type)) )
 #define snewn(number, type) ( (type *) smalloc ((number) * sizeof (type)) )
diff --git a/malloc.c b/malloc.c
index 2ff22fd..4389d8a 100644
--- a/malloc.c
+++ b/malloc.c
@@ -91,7 +91,7 @@ void *(srealloc)(LOGPARAMS void *p, int size) {
  * dupstr is like strdup, but with the never-return-NULL property
  * of smalloc (and also reliably defined in all environments :-)
  */
-char *dupstr(char *s) {
+char *dupstr(char const *s) {
     char *r = smalloc(1+strlen(s));
     strcpy(r,s);
     return r;