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-rw-r--r--src/calcurse.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/calcurse.h b/src/calcurse.h
index 35a64f0..ee6612f 100644
--- a/src/calcurse.h
+++ b/src/calcurse.h
@@ -893,7 +893,7 @@ void status_mesg (char *, char *);
void erase_window_part (WINDOW *, int, int, int, int);
WINDOW *popup (int, int, int, int, char *, char *, int);
void print_in_middle (WINDOW *, int, int, int, char *);
-int is_all_digit (char *);
+int is_all_digit (const char *);
long get_item_time (long);
int get_item_hour (long);
int get_item_min (long);