diff --git a/lib/puppet/parser/functions/round.rb b/lib/puppet/parser/functions/round.rb
deleted file mode 100644
index a528e0cdb..000000000
--- a/lib/puppet/parser/functions/round.rb
+++ /dev/null
@@ -1,33 +0,0 @@
-# frozen_string_literal: true
-
-#
-# round.rb
-#
-module Puppet::Parser::Functions
-  newfunction(:round, type: :rvalue, doc: <<-DOC
-    @summary
-      Rounds a number to the nearest integer
-
-    @return
-      the rounded value as integer
-
-    @example Example usage
-        round(2.9) #=> 3
-        round(2.4) #=> 2
-
-    > *Note:* from Puppet 6.0.0, the compatible function with the same name in Puppet core
-      will be used instead of this function.
-  DOC
-  ) do |args|
-    raise Puppet::ParseError, "round(): Wrong number of arguments given #{args.size} for 1" if args.size != 1
-    raise Puppet::ParseError, "round(): Expected a Numeric, got #{args[0].class}" unless args[0].is_a? Numeric
-
-    value = args[0]
-
-    if value >= 0
-      Integer(value + 0.5)
-    else
-      Integer(value - 0.5)
-    end
-  end
-end
diff --git a/spec/functions/round_spec.rb b/spec/functions/round_spec.rb
deleted file mode 100644
index 7b3baf1b3..000000000
--- a/spec/functions/round_spec.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe 'round', if: Puppet::Util::Package.versioncmp(Puppet.version, '6.0.0') < 0 do
-  it { is_expected.not_to eq(nil) }
-  it { is_expected.to run.with_params(34.3).and_return(34) }
-  it { is_expected.to run.with_params(-34.3).and_return(-34) }
-  it { is_expected.to run.with_params(34.5).and_return(35) }
-  it { is_expected.to run.with_params(-34.5).and_return(-35) }
-  it { is_expected.to run.with_params(34.7).and_return(35) }
-  it { is_expected.to run.with_params(-34.7).and_return(-35) }
-  it { is_expected.to run.with_params('test').and_raise_error Puppet::ParseError }
-  it { is_expected.to run.with_params('test', 'best').and_raise_error Puppet::ParseError }
-  it { is_expected.to run.with_params(3, 4).and_raise_error Puppet::ParseError }
-end