diff --git a/README.md b/README.md
index 98859f8..f10ea61 100644
--- a/README.md
+++ b/README.md
@@ -44,9 +44,6 @@ This config file contains all the configurable settings for the plugin, see comm
 $c->{plugins}{"Export::DataCiteXML"}{params}{disable} = 0;
 $c->{plugins}{"Event::DataCiteEvent"}{params}{disable} = 0;
 
-# Regex to match pre production servers
-# $c->{datacitedoi}{test_host_regex} = 'dev|test|preprod';
-
 # which field to use for the doi
 $c->{datacitedoi}{eprintdoifield} = "id_number";
 
diff --git a/cfg/cfg.d/z_datacitedoi.pl b/cfg/cfg.d/z_datacitedoi.pl
index 3ace279..40191a6 100644
--- a/cfg/cfg.d/z_datacitedoi.pl
+++ b/cfg/cfg.d/z_datacitedoi.pl
@@ -2,9 +2,6 @@
 $c->{plugins}{"Export::DataCiteXML"}{params}{disable} = 0;
 $c->{plugins}{"Event::DataCiteEvent"}{params}{disable} = 0;
 
-# Regex to match pre production servers
-# $c->{datacitedoi}{test_host_regex} = 'dev|test|preprod';
-
 # which field to use for the doi
 $c->{datacitedoi}{eprintdoifield} = "id_number";
 
diff --git a/lib/cfg.d/z_datacite_mapping.pl b/lib/cfg.d/z_datacite_mapping.pl
index 9d43d61..4eb55bb 100644
--- a/lib/cfg.d/z_datacite_mapping.pl
+++ b/lib/cfg.d/z_datacite_mapping.pl
@@ -464,25 +464,6 @@
 
 	my @problems = ();
 
-	# If this host is not production it should probably use a test endpoint.
-	# To prevent this check change the test_host_regex regex not to match hostname
-	# or ensure test_host_regex is undefined (as is the default)
-
-	my $test_regex = $repository->get_conf("datacitedoi", "test_host_regex");
-	if (defined $test_regex){
-		use Sys::Hostname;
-		my $doi_prefix = $repository->get_conf("datacitedoi", "prefix");
-
-		# Does this host match the regex? Is it using the test DOI prefix?
-		if ((hostname =~ $test_regex) && ("10.5072" != $doi_prefix)) {
-			push @problems, $repository->html_phrase(
-				"datacite_validate:doi_prefix_mismatch",
-				match_regexp=> $xml->create_text_node("$test_regex"),
-				configured_doi_prefix=> $xml->create_text_node("$doi_prefix"),
-			);
-		}
-	}
-
     #NEED CREATORS
 	if( !$eprint->is_set( "creators" ) && 
 		!$eprint->is_set( "corp_creators" ) )
diff --git a/lib/lang/en/phrases/coinDOI.xml b/lib/lang/en/phrases/coinDOI.xml
index 692bc44..f60fca6 100644
--- a/lib/lang/en/phrases/coinDOI.xml
+++ b/lib/lang/en/phrases/coinDOI.xml
@@ -125,8 +125,6 @@
 
     <epp:phrase id="datacite_validate:need_published_year"><p>There are no suitable values for the mandatory field <strong>datacite:PublicationYear</strong>. Please supply a <epc:pin name="dates">publication date</epc:pin> before coining a DOI.</p></epp:phrase>
 
-    <epp:phrase id="datacite_validate:doi_prefix_mismatch"><p>Your server hostname matches the preprod regex <strong><epc:pin name="match_regexp" textonly="yes" /></strong> but is not using the test DOI prefix - current prefix is <strong><epc:pin name="configured_doi_prefix" /></strong>.</p></epp:phrase>
-
     <!-- Would be nice to hotlink the plugin typemap too -->
     <epp:phrase id="datacite_validate:need_mapped_type"><p>Your eprint is either <epc:pin name="types">missing its type</epc:pin> or the type has no match in the plugin typemap.</p></epp:phrase>