diff --git a/mrbgems/mruby-random/src/random.c b/mrbgems/mruby-random/src/random.c
index 0ba9b1bb9..241e0b47d 100644
--- a/mrbgems/mruby-random/src/random.c
+++ b/mrbgems/mruby-random/src/random.c
@@ -385,8 +385,8 @@ void mrb_mruby_random_gem_init(mrb_state *mrb)
 
   mrb_static_assert(sizeof(rand_state) <= ISTRUCT_DATA_SIZE);
 
-  mrb_define_method_id(mrb, mrb->kernel_module, MRB_SYM(rand), random_f_rand, MRB_ARGS_OPT(1));
-  mrb_define_method_id(mrb, mrb->kernel_module, MRB_SYM(srand), random_f_srand, MRB_ARGS_OPT(1));
+  mrb_define_private_method_id(mrb, mrb->kernel_module, MRB_SYM(rand), random_f_rand, MRB_ARGS_OPT(1));
+  mrb_define_private_method_id(mrb, mrb->kernel_module, MRB_SYM(srand), random_f_srand, MRB_ARGS_OPT(1));
 
   struct RClass *random = mrb_define_class_id(mrb, MRB_SYM(Random), mrb->object_class);
   mrb_const_set(mrb, mrb_obj_value(mrb->object_class), ID_RANDOM, mrb_obj_value(random)); // for class check
diff --git a/mrbgems/mruby-random/test/random.rb b/mrbgems/mruby-random/test/random.rb
index 7426aad20..181ef56da 100644
--- a/mrbgems/mruby-random/test/random.rb
+++ b/mrbgems/mruby-random/test/random.rb
@@ -9,7 +9,7 @@ assert("Random.new") do
   assert_not_equal(r1.rand, r3.rand)
 end
 
-assert("Kernel.srand") do
+assert("Kernel#srand") do
   srand(234)
   r1 = rand
   srand(234)
@@ -45,7 +45,7 @@ assert("Random#bytes") do
   assert_equal num / 2, b.bytesize
 end
 
-assert("return class of Kernel.rand") do
+assert("return class of Kernel#rand") do
   assert_kind_of(Integer, rand(3))
   assert_kind_of(Integer, rand(1.5))
   skip unless Object.const_defined?(:Float)