diff --git a/lib/libstand/environment.c b/lib/libstand/environment.c
index 1365a1c601d4..1a3cfc7e5fef 100644
--- a/lib/libstand/environment.c
+++ b/lib/libstand/environment.c
@@ -207,7 +207,7 @@ env_discard(struct env_var *ev)
 }
 
 int
-env_noset(struct env_var *ev, int flags, void *value)
+env_noset(struct env_var *ev, int flags, const void *value)
 {
     return(EPERM);
 }
diff --git a/lib/libstand/stand.h b/lib/libstand/stand.h
index e08c5bb27c20..bf4ed289bba5 100644
--- a/lib/libstand/stand.h
+++ b/lib/libstand/stand.h
@@ -291,7 +291,8 @@ extern int	pager_file(const char *fname);
 
 struct env_var;
 typedef char	*(ev_format_t)(struct env_var *ev);
-typedef int	(ev_sethook_t)(struct env_var *ev, int flags, void *value);
+typedef int	(ev_sethook_t)(struct env_var *ev, int flags,
+		    const void *value);
 typedef int	(ev_unsethook_t)(struct env_var *ev);
 
 struct env_var