1 files changed, 1 insertions, 1 deletions
diff --git a/malloc.c b/malloc.c
index a8d4554653..914436e968 100644
--- a/malloc.c
+++ b/malloc.c
@@ -2463,7 +2463,7 @@ Perl_get_mstats(pTHX_ perl_mstats_t *buf, int buflen, int level)
  * frees for each size category.
  */
 void
-Perl_dump_mstats(pTHX_ char *s)
+Perl_dump_mstats(pTHX_ const char *s)
 {
 #ifdef DEBUGGING_MSTATS
   	register int i;