1 files changed, 2 insertions, 2 deletions
diff --git a/spec/aliases/string_spec.rb b/spec/aliases/string_spec.rb
index 8a93585..3ea1967 100644
--- a/spec/aliases/string_spec.rb
+++ b/spec/aliases/string_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-if Puppet.version.to_f >= 4.5
+if Puppet::Util::Package.versioncmp(Puppet.version, '4.5.0') >= 0
   describe 'test::string', type: :class do
     describe 'accepts strings' do
       [
@@ -24,7 +24,7 @@ if Puppet.version.to_f >= 4.5
       ].each do |value|
         describe value.inspect do
           let(:params) {{ value: value }}
-          it { is_expected.to compile.and_raise_error(/parameter 'value' expects a String/) }
+          it { is_expected.to compile.and_raise_error(/parameter 'value' expects a (?:value of type Undef or )?String/) }
         end
       end
     end