diff --git a/plantuml-mode.el b/plantuml-mode.el
index a7c5632..1fd38aa 100644
--- a/plantuml-mode.el
+++ b/plantuml-mode.el
@@ -220,7 +220,7 @@ default output type for new buffers."
   `(start-process "PLANTUML" ,buf
                   plantuml-java-command
                   ,@plantuml-java-args
-                  (shell-quote-argument (expand-file-name plantuml-jar-path))
+                  (expand-file-name plantuml-jar-path)
                   (plantuml-output-type-opt) "-p"))
 
 (defun plantuml-preview-string (prefix string)