diff --git a/lib/Zonemaster/Backend/DB.pm b/lib/Zonemaster/Backend/DB.pm
index 1a3e2d5fd..2284897a3 100644
--- a/lib/Zonemaster/Backend/DB.pm
+++ b/lib/Zonemaster/Backend/DB.pm
@@ -16,8 +16,8 @@ use POSIX qw( strftime );
 use Readonly;
 use Try::Tiny;
 
-use Zonemaster::Engine::Normalization;
 use Zonemaster::Backend::Errors;
+use Zonemaster::Engine::Normalization;
 use Zonemaster::Engine::Logger::Entry;
 
 requires qw(
@@ -875,7 +875,7 @@ sub process_dead_test {
 sub _normalize_domain {
     my ( $domain ) = @_;
 
-    my ( $errors, $normalized_domain ) = normalize_name( $domain );
+    my ( $errors, $normalized_domain ) = normalize_name( trim_space( $domain ) );
 
     if ( scalar( @{$errors} ) ) {
         die Zonemaster::Backend::Error::Internal->new( reason => "Normalizing domain returned errors.", data => [ map { $_->string } @{$errors} ] );
diff --git a/lib/Zonemaster/Backend/RPCAPI.pm b/lib/Zonemaster/Backend/RPCAPI.pm
index 48d98830e..a024724cc 100644
--- a/lib/Zonemaster/Backend/RPCAPI.pm
+++ b/lib/Zonemaster/Backend/RPCAPI.pm
@@ -22,7 +22,7 @@ use Encode;
 
 # Zonemaster Modules
 use Zonemaster::Engine;
-use Zonemaster::Engine::Normalization;
+use Zonemaster::Engine::Normalization qw( normalize_name trim_space );
 use Zonemaster::Engine::Profile;
 use Zonemaster::Engine::Recursor;
 use Zonemaster::Backend;
@@ -224,7 +224,7 @@ sub get_data_from_parent_zone {
     my $result = eval {
         my %result;
         my $domain = $params->{domain};
-        my ( $_errors, $normalized_domain ) = normalize_name( $domain );
+        my ( $_errors, $normalized_domain ) = normalize_name( trim_space ( $domain ) );
 
         my @ns_list;
         my @ns_names;
diff --git a/lib/Zonemaster/Backend/Validator.pm b/lib/Zonemaster/Backend/Validator.pm
index 9a8dca524..1d7f4f36c 100644
--- a/lib/Zonemaster/Backend/Validator.pm
+++ b/lib/Zonemaster/Backend/Validator.pm
@@ -13,7 +13,7 @@ use Readonly;
 use Locale::TextDomain qw[Zonemaster-Backend];
 use Net::IP::XS;
 use Zonemaster::Engine::Logger::Entry;
-use Zonemaster::Engine::Normalization;
+use Zonemaster::Engine::Normalization qw( normalize_name trim_space );
 use Zonemaster::LDNS;
 
 our @EXPORT_OK = qw(
@@ -282,7 +282,7 @@ sub check_domain {
         return N__ 'Domain name required';
     }
 
-    my ( $errors, $_domain ) = normalize_name( $domain );
+    my ( $errors, $_domain ) = normalize_name( trim_space( $domain ) );
 
     if ( @{$errors} ) {
         return $errors->[0]->message;