2 files changed, 3 insertions, 3 deletions

diff --git a/lib/libc/stdlib/malloc.3 b/lib/libc/stdlib/malloc.3
index 4271ff80c5764..a78d830163944 100644
--- a/lib/libc/stdlib/malloc.3
+++ b/lib/libc/stdlib/malloc.3
@@ -56,8 +56,8 @@
 .Fn reallocf "void *ptr" "size_t size"
 .Ft void
 .Fn free "void *ptr"
-.Ft char *
-.Va _malloc_options
+.Ft const char *
+.Va _malloc_options;
 .Ft void
 .Fn \*(lp*_malloc_message\*(rp "char *p1" "char *p2" "char *p3" "char *p4"
 .Sh DESCRIPTION
diff --git a/lib/libc/stdlib/malloc.c b/lib/libc/stdlib/malloc.c
index 43aad2d792114..d2371bdd69a23 100644
--- a/lib/libc/stdlib/malloc.c
+++ b/lib/libc/stdlib/malloc.c
@@ -267,7 +267,7 @@ static void *malloc_brk;
 static struct pgfree *px;
 
 /* compile-time options */
-char *_malloc_options;
+const char *_malloc_options;
 
 /* Name of the current public function */
 static char *malloc_func;