diff --git a/Smarty.php b/Smarty.php
index 1f5f9da..51310b6 100644
--- a/Smarty.php
+++ b/Smarty.php
@@ -107,15 +107,15 @@ public function getInstance()
             }
 
             $this->parserInstance = new \Smarty();
-            $this->parserInstance->template_dir = $this->getTemplatesDirectory();
+            $this->parserInstance->setTemplateDir($this->getTemplatesDirectory());
             if ($this->parserExtensions) {
                 $this->parserInstance->addPluginsDir($this->parserExtensions);
             }
             if ($this->parserCompileDirectory) {
-                $this->parserInstance->compile_dir = $this->parserCompileDirectory;
+                $this->parserInstance->setCompileDir($this->parserCompileDirectory);
             }
             if ($this->parserCacheDirectory) {
-                $this->parserInstance->cache_dir = $this->parserCacheDirectory;
+                $this->parserInstance->setCacheDir($this->parserCacheDirectory);
             }
         }