diff --git a/NEWS b/NEWS
index 0b8caca210..85ccdac4e5 100644
--- a/NEWS
+++ b/NEWS
@@ -116,6 +116,10 @@ with all sufficient information, see the ChangeLog file or Redmine
 
     * added Random.bytes. [Feature #4938]
 
+* Range
+
+  * Range#=== now uses #cover? instead of #include? method. [Feature #14575]
+
 * String
 
   * String#split yields each substring to the block if given. [Feature #4780]
diff --git a/range.c b/range.c
index 917d24bd83..dcae2b2397 100644
--- a/range.c
+++ b/range.c
@@ -1212,6 +1212,8 @@ range_inspect(VALUE range)
     return rb_exec_recursive(inspect_range, range, 0);
 }
 
+static VALUE range_include_internal(VALUE range, VALUE val);
+
 /*
  *  call-seq:
  *     rng === obj       ->  true or false
@@ -1234,7 +1236,9 @@ range_inspect(VALUE range)
 static VALUE
 range_eqq(VALUE range, VALUE val)
 {
-    return rb_funcall(range, rb_intern("include?"), 1, val);
+    VALUE ret = range_include_internal(range, val);
+    if (ret != Qundef) return ret;
+    return r_cover_p(range, RANGE_BEG(range), RANGE_END(range), val);
 }
 
 
@@ -1254,6 +1258,14 @@ range_eqq(VALUE range, VALUE val)
 
 static VALUE
 range_include(VALUE range, VALUE val)
+{
+    VALUE ret = range_include_internal(range, val);
+    if (ret != Qundef) return ret;
+    return rb_call_super(1, &val);
+}
+
+static VALUE
+range_include_internal(VALUE range, VALUE val)
 {
     VALUE beg = RANGE_BEG(range);
     VALUE end = RANGE_END(range);
@@ -1277,8 +1289,7 @@ range_include(VALUE range, VALUE val)
 	    return Qfalse;
 	}
     }
-    /* TODO: ruby_frame->this_func = rb_intern("include?"); */
-    return rb_call_super(1, &val);
+    return Qundef;
 }
 
 
diff --git a/spec/ruby/core/range/case_compare_spec.rb b/spec/ruby/core/range/case_compare_spec.rb
index e0da683649..9a33c5b73b 100644
--- a/spec/ruby/core/range/case_compare_spec.rb
+++ b/spec/ruby/core/range/case_compare_spec.rb
@@ -3,9 +3,18 @@ require_relative 'shared/cover_and_include'
 require_relative 'shared/cover'
 
 describe "Range#===" do
-  it "returns the result of calling #include? on self" do
-    range = 0...10
-    range.should_receive(:include?).with(2).and_return(:true)
-    (range === 2).should == :true
+  ruby_version_is ""..."2.6" do
+    it "returns the result of calling #include? on self" do
+      range = 0...10
+      range.should_receive(:include?).with(2).and_return(:true)
+      (range === 2).should == :true
+    end
+  end
+
+  ruby_version_is "2.6" do
+    it "returns the result of calling #cover? on self" do
+      range = RangeSpecs::Custom.new(0)..RangeSpecs::Custom.new(10)
+      (range === RangeSpecs::Custom.new(2)).should == true
+    end
   end
 end
diff --git a/test/ruby/test_range.rb b/test/ruby/test_range.rb
index 5f2e970324..c98b130456 100644
--- a/test/ruby/test_range.rb
+++ b/test/ruby/test_range.rb
@@ -473,6 +473,16 @@ class TestRange < Test::Unit::TestCase
     assert_operator(c.new(0)..c.new(10), :===, c.new(5), bug12003)
   end
 
+  def test_eqq_non_iteratable
+    k = Class.new do
+      include Comparable
+      attr_reader :i
+      def initialize(i) @i = i; end
+      def <=>(o); i <=> o.i; end
+    end
+    assert_operator(k.new(0)..k.new(2), :===, k.new(1))
+  end
+
   def test_include
     assert_include("a".."z", "c")
     assert_not_include("a".."z", "5")