diff --git a/mrbgems/mruby-array-ext/src/array.c b/mrbgems/mruby-array-ext/src/array.c
index 5490de950..058a49820 100644
--- a/mrbgems/mruby-array-ext/src/array.c
+++ b/mrbgems/mruby-array-ext/src/array.c
@@ -888,9 +888,7 @@ ary_fill_exec(mrb_state *mrb, mrb_value self)
 static mrb_value
 ary_uniq(mrb_state *mrb, mrb_value self)
 {
-  struct RArray *ary = mrb_ary_ptr(self);
-  mrb_int len = ARY_LEN(ary);
-  mrb_value *ptr = ARY_PTR(ary);
+  mrb_int len = RARRAY_LEN(self);
   mrb_value result = mrb_ary_new_capa(mrb, len);
 
   if (len == 0) {
@@ -900,7 +898,7 @@ ary_uniq(mrb_state *mrb, mrb_value self)
   if (len > SET_OP_HASH_THRESHOLD) {
     mrb_value hash = mrb_hash_new_capa(mrb, len);
     for (mrb_int i = 0; i < len; i++) {
-      mrb_value elem = ptr[i];
+      mrb_value elem = RARRAY_PTR(self)[i];
       if (mrb_nil_p(mrb_hash_get(mrb, hash, elem))) {
         mrb_hash_set(mrb, hash, elem, mrb_true_value());
         mrb_ary_push(mrb, result, elem);
@@ -909,11 +907,11 @@ ary_uniq(mrb_state *mrb, mrb_value self)
   }
   else {
     for (mrb_int i = 0; i < len; i++) {
-      mrb_value elem = ptr[i];
+      mrb_value elem = RARRAY_PTR(self)[i];
       mrb_bool found = FALSE;
-      mrb_value *result_ptr = ARY_PTR(RARRAY(result));
-      for (mrb_int j = 0; j < RARRAY_LEN(result); j++) {
-        if (mrb_equal(mrb, elem, result_ptr[j])) {
+      mrb_int result_len = RARRAY_LEN(result);
+      for (mrb_int j = 0; j < result_len; j++) {
+        if (mrb_equal(mrb, elem, RARRAY_PTR(result)[j])) {
           found = TRUE;
           break;
         }