diff --git a/src/options.c b/src/options.c
index dfe306de..96f00148 100644
--- a/src/options.c
+++ b/src/options.c
@@ -49,7 +49,7 @@ long mi_option_get(mi_option_t option) {
   if (desc->init == UNINIT) {
     mi_option_init(desc);
     if (option != mi_option_verbose) {
-      _mi_verbose_message("option '%s': %zd\n", desc->name, desc->value);
+      _mi_verbose_message("option '%s': %ld\n", desc->name, desc->value);
     }
   }
   return desc->value;
diff --git a/src/stats.c b/src/stats.c
index 807ef5f0..7b8de6ce 100644
--- a/src/stats.c
+++ b/src/stats.c
@@ -188,7 +188,7 @@ static void mi_stats_print_bins(mi_stat_count_t* all, const mi_stat_count_t* bin
     if (bins[i].allocated > 0) {
       found = true;
       int64_t unit = _mi_bin_size((uint8_t)i);
-      snprintf(buf, 64, "%s %3zd", fmt, i);
+      snprintf(buf, 64, "%s %3zu", fmt, i);
       mi_stat_add(all, &bins[i], unit);
       mi_stat_print(&bins[i], buf, unit, out);
     }