diff --git a/Upload.class.php b/Upload.class.php
index 7c67716..5b9ce88 100644
--- a/Upload.class.php
+++ b/Upload.class.php
@@ -67,9 +67,14 @@ abstract class Upload
         $image->variants[$size] = $image_variant;
         if (Config::get('PYTHON_PIL_RESIZE')) {
             $script_file_path = Config::get('PYTHON_PIL_RESIZE')->script_file_path;
-            $pil_options = isset(Config::get('PYTHON_PIL_RESIZE')->pil_options) ? implode(' ', Config::get('PYTHON_PIL_RESIZE')->pil_options) . ' ' : '';
+            $pil_options = isset(Config::get('PYTHON_PIL_RESIZE')->pil_options) ? ' ' . implode(' ', Config::get('PYTHON_PIL_RESIZE')->pil_options) : '';
             ob_start();
-            exec($script_file_path . ' --width=' . $size_parts[0] . ' --height=' . $size_parts[1] . ' ' . $pil_options . self::getFilePath($image) . ' ' . self::getFilePath($image_variant));
+            exec($script_file_path
+                . (($size_parts[0])?' --width=' . $size_parts[0]:'')
+                . (($size_parts[1])?' --height=' . $size_parts[1]:'')
+                . $pil_options
+                . ' ' . self::getFilePath($image)
+                . ' ' . self::getFilePath($image_variant));
             ob_clean();
         }
     }