diff --git a/src/Form/JsonLdSettingsForm.php b/src/Form/JsonLdSettingsForm.php
index d4616b8..2fbcf11 100644
--- a/src/Form/JsonLdSettingsForm.php
+++ b/src/Form/JsonLdSettingsForm.php
@@ -57,6 +57,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       $rdf_namespaces .= $namespace['prefix'] . '|' . $namespace['namespace'] . "\n";
     }
     $mapping_string = '';
+    ksort($mappings_from_hook);
     foreach ($mappings_from_hook as $pref => $nspace) {
       $mapping_string .= "$pref|$nspace \n";
     }
diff --git a/src/Normalizer/NormalizerBase.php b/src/Normalizer/NormalizerBase.php
index cb66c76..9836880 100644
--- a/src/Normalizer/NormalizerBase.php
+++ b/src/Normalizer/NormalizerBase.php
@@ -57,7 +57,7 @@ public function supportsDenormalization($data, $type, $format = NULL) {
    */
   public static function escapePrefix($predicate, array $namespaces) {
 
-    $exploded = explode(":", $predicate);
+    $exploded = explode(":", $predicate, 2);
     if (!isset($namespaces[$exploded[0]])) {
       return $predicate;
     }