diff --git a/ChangeLog b/ChangeLog
index e2f7a3f98e..a080976c02 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Mar 18 00:15:05 2016  Yusuke Endoh  <mame@ruby-lang.org>
+
+	* numeric.c (num_step): use rb_equal for zero check. rb_num_coerce_cmp
+	  created an object which caused extra overhead. 
+
 Thu Mar 17 22:21:34 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (RB_GC_GUARD_PTR): remove intermediate
diff --git a/numeric.c b/numeric.c
index 7f43fdb2a5..2c382bb498 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2224,7 +2224,7 @@ num_step(int argc, VALUE *argv, VALUE from)
     RETURN_SIZED_ENUMERATOR(from, argc, argv, num_step_size);
 
     desc = num_step_scan_args(argc, argv, &to, &step);
-    if (RTEST(rb_num_coerce_cmp(step, INT2FIX(0), id_eq))) {
+    if (rb_equal(step, INT2FIX(0))) {
 	inf = 1;
     }
     else if (RB_TYPE_P(to, T_FLOAT)) {