diff --git a/lib/puppet/functions/apache/bool2httpd.rb b/lib/puppet/functions/apache/bool2httpd.rb
index 99121640..511adba6 100644
--- a/lib/puppet/functions/apache/bool2httpd.rb
+++ b/lib/puppet/functions/apache/bool2httpd.rb
@@ -1,24 +1,30 @@
 # @summary
 #   Transform a supposed boolean to On or Off. Passes all other values through.
 #
 Puppet::Functions.create_function(:'apache::bool2httpd') do
   # @param arg
   #   The value to be converted into a string.
   #
   # @return
   #   Will return either `On` or `Off` if given a boolean value. Returns a string of any
   #   other given value.
   # @example
   #   $trace_enable     = false
   #   $server_signature = 'mail'
   #
   #   apache::bool2httpd($trace_enable) # returns 'Off'
   #   apache::bool2httpd($server_signature) # returns 'mail'
   #   apache::bool2httpd(undef) # returns 'Off'
   #
   def bool2httpd(arg)
-    return 'Off' if arg.nil? || arg == false || arg =~ %r{false}i || arg == :undef
-    return 'On' if arg == true || arg =~ %r{true}i
+    return 'Off' if arg.nil? || arg == false || matches_string?(arg, %r{false}i) || arg == :undef
+    return 'On' if arg == true || matches_string?(arg, %r{true}i)
     arg.to_s
   end
+
+  private
+
+  def matches_string?(value, matcher)
+    value.is_a?(String) && value.match?(matcher)
+  end
 end
diff --git a/spec/functions/bool2httpd_spec.rb b/spec/functions/bool2httpd_spec.rb
index e436e0e3..fabcf274 100644
--- a/spec/functions/bool2httpd_spec.rb
+++ b/spec/functions/bool2httpd_spec.rb
@@ -1,29 +1,31 @@
 require 'spec_helper'
 
 shared_examples 'apache::bool2httpd function' do
   it { is_expected.not_to eq(nil) }
   it { is_expected.to run.with_params.and_raise_error(ArgumentError) }
   it { is_expected.to run.with_params('1', '2').and_raise_error(ArgumentError) }
   it { is_expected.to run.with_params(true).and_return('On') }
+  it { is_expected.to run.with_params('true').and_return('On') }
   it 'expected to return a string "On"' do
     expect(subject.execute(true)).to be_an_instance_of(String)
   end
   it { is_expected.to run.with_params(false).and_return('Off') }
+  it { is_expected.to run.with_params('false').and_return('Off') }
   it 'expected to return a string "Off"' do
     expect(subject.execute(false)).to be_an_instance_of(String)
   end
   it { is_expected.to run.with_params('mail').and_return('mail') }
   it { is_expected.to run.with_params(nil).and_return('Off') }
   it { is_expected.to run.with_params(:undef).and_return('Off') }
   it { is_expected.to run.with_params('foo').and_return('foo') }
 end
 
 describe 'apache::bool2httpd' do
   it_behaves_like 'apache::bool2httpd function'
 
   describe 'deprecated non-namespaced shim' do
     describe 'bool2httpd', type: :puppet_function do
       it_behaves_like 'apache::bool2httpd function'
     end
   end
 end