1 files changed, 3 insertions, 3 deletions
diff --git a/list.h b/list.h
index 7403bc0..c68a78d 100644
--- a/list.h
+++ b/list.h
@@ -32,11 +32,11 @@ typedef struct _List {
     struct _List *next;
 } ListRec, *ListPtr;
 
-int listMember(char *elt, ListPtr list);
+int listMember(const char *elt, ListPtr list);
 ListPtr listCons(char *car, ListPtr cdr);
 ListPtr listAdjoin(char *car, ListPtr cdr);
-ListPtr listConsF(ListPtr cdr, char *f, ...) _X_ATTRIBUTE_PRINTF(2,3);
-ListPtr listAdjoinF(ListPtr cdr, char *f, ...) _X_ATTRIBUTE_PRINTF(2,3);
+ListPtr listConsF(ListPtr cdr, const char *f, ...) _X_ATTRIBUTE_PRINTF(2,3);
+ListPtr listAdjoinF(ListPtr cdr, const char *f, ...) _X_ATTRIBUTE_PRINTF(2,3);
 int listLength(ListPtr list);
 ListPtr appendList(ListPtr first, ListPtr second);
 ListPtr makeList(char **a, int n, ListPtr old, int begin);