diff --git a/src/checkpoint.c b/src/checkpoint.c
index a07a54ea..534e0d5b 100644
--- a/src/checkpoint.c
+++ b/src/checkpoint.c
@@ -182,7 +182,7 @@ getarg (char const *input, char const **endp, char **argbuf, idx_t *arglen)
 {
   if (input[0] == '{')
     {
-      char *p = strchr (input + 1, '}');
+      char const *p = strchr (input + 1, '}');
       if (p)
 	{
 	  idx_t n = p - input;
diff --git a/src/tar.c b/src/tar.c
index 7dcdf68a..0ccd8998 100644
--- a/src/tar.c
+++ b/src/tar.c
@@ -1285,7 +1285,7 @@ expand_pax_option (struct tar_args *targs, const char *arg)
   while (*arg)
     {
       idx_t seglen = strcspn (arg, ",");
-      char *p = memchr (arg, '=', seglen);
+      char const *p = memchr (arg, '=', seglen);
       if (p)
 	{
 	  idx_t len = p - arg + 1;