diff --git a/src/JasperPHP/JasperPHP.php b/src/JasperPHP/JasperPHP.php
index 8a06c89..24aa14b 100644
--- a/src/JasperPHP/JasperPHP.php
+++ b/src/JasperPHP/JasperPHP.php
@@ -95,7 +95,7 @@ public function process($input_file, $output_file = false, $format = array("pdf"
             $command .= " -P";
             foreach ($parameters as $key => $value)
             {
-                $command .= " " . $key . "=" . $value;
+                $command .= " " . $key . '="' . $value .'"';
             }
         }