diff --git a/tileserver.php b/tileserver.php
index 8c57f41..b614e1c 100644
--- a/tileserver.php
+++ b/tileserver.php
@@ -636,6 +636,10 @@ public function metadataTileJson($metadata) {
       }
       unset($metadata['json']);
     }
+    if (array_key_exists('tile_matrix', $metadata)) {
+      $tile_matrix = json_decode(stripslashes($metadata['tile_matrix']));
+      $metadata['tile_matrix'] = $tile_matrix;
+    }
     return $metadata;
   }