diff --git a/src/Generator/Schema.php b/src/Generator/Schema.php
index 840b93a..0308e1d 100644
--- a/src/Generator/Schema.php
+++ b/src/Generator/Schema.php
@@ -51,7 +51,15 @@ public static function generate(string $name, string $namespace, string $classNa
         );
 
         foreach ($schema->properties as $propertyName => $property) {
-            $propertyName = trim($propertyName, '@');
+            $propertyName = str_replace([
+                '@',
+                '+',
+                '-',
+            ], [
+                '_AT_',
+                '_PLUSES_',
+                '_MINUS_',
+            ], $propertyName);
             $propertyStmt = $factory->property($propertyName)->makePrivate();
             $docBlock = [];
             if (strlen($property->description) > 0) {