1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index fe27fd4c2f..750e920bbf 100644
--- a/string.c
+++ b/string.c
@@ -4141,7 +4141,7 @@ rb_str_oct(VALUE str)
 static VALUE
 rb_str_crypt(VALUE str, VALUE salt)
 {
-    extern char *crypt(char *, char *);
+    extern char *crypt(const char *, const char *);
     VALUE result;
     char *s;