diff --git a/mrblib/numeric.rb b/mrblib/numeric.rb
index a047f019c..0d8dff8a0 100644
--- a/mrblib/numeric.rb
+++ b/mrblib/numeric.rb
@@ -104,7 +104,7 @@ class Integer
     raise ArgumentError, "step can't be 0" if step == 0
     return to_enum(:step, num, step) unless block
 
-    i = __coerce_step_counter(num, step)
+    i = __coerce_step_counter(step)
     if num == self || step.infinite?
       block.call(i) if step > 0 && i <= (num||i) || step < 0 && i >= (num||-i)
     elsif num == nil
diff --git a/src/numeric.c b/src/numeric.c
index 59e0c59ee..50f27e913 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -266,17 +266,13 @@ int_quo(mrb_state *mrb, mrb_value x)
 static mrb_value
 coerce_step_counter(mrb_state *mrb, mrb_value self)
 {
-  mrb_value num, step;
-
-  mrb_get_args(mrb, "oo", &num, &step);
-
-#ifndef MRB_NO_FLOAT
   mrb->c->ci->mid = 0;
-  if (mrb_float_p(num) || mrb_float_p(step)) {
+  mrb_value step = mrb_get_arg1(mrb);
+#ifndef MRB_NO_FLOAT
+  if (mrb_float_p(step)) {
     return mrb_ensure_float_type(mrb, self);
   }
 #endif
-
   return self;
 }
 
@@ -2169,7 +2165,7 @@ mrb_init_numeric(mrb_state *mrb)
   mrb_define_method_id(mrb, integer, MRB_SYM(to_s),     int_to_s,        MRB_ARGS_OPT(1)); /* 15.2.8.3.25 */
   mrb_define_method_id(mrb, integer, MRB_SYM(inspect),  int_to_s,        MRB_ARGS_OPT(1));
   mrb_define_method_id(mrb, integer, MRB_SYM(divmod),   int_divmod,      MRB_ARGS_REQ(1)); /* 15.2.8.3.30(x) */
-  mrb_define_method_id(mrb, integer, MRB_SYM(__coerce_step_counter), coerce_step_counter, MRB_ARGS_REQ(2));
+  mrb_define_method_id(mrb, integer, MRB_SYM(__coerce_step_counter), coerce_step_counter, MRB_ARGS_REQ(1));
 
   /* Fixnum Class for compatibility */
   mrb_define_const_id(mrb, mrb->object_class, MRB_SYM(Fixnum), mrb_obj_value(integer));
diff --git a/test/t/numeric.rb b/test/t/numeric.rb
index 8baf6c883..5c256ea90 100644
--- a/test/t/numeric.rb
+++ b/test/t/numeric.rb
@@ -66,7 +66,7 @@ assert('Numeric#step') do
   skip unless Object.const_defined?(:Float)
   inf = Float::INFINITY
   assert_raise(ArgumentError) { 1.step(2, 0.0) { break } }
-  assert_step([2.0, 3.0, 4.0], 2, [4.0])
+  assert_step([2, 3, 4], 2, [4.0])
   assert_step([7.0, 4.0, 1.0, -2.0], 7, [-4, -3.0])
   assert_step([2.0, 3.0, 4.0], 2.0, [4])
   assert_step([10.0, 11.0, 12.0, 13.0], 10.0, [], inf: true)