diff --git a/lib/converter.php b/lib/converter.php
index b3bc7ca9..5a5a9144 100644
--- a/lib/converter.php
+++ b/lib/converter.php
@@ -49,6 +49,7 @@ class Converter {
 		$params = ' --headless --convert-to ' . $targetFilter . ' --outdir ' 
 				. escapeshellarg($outdir) 
 				. ' --writer '. escapeshellarg($infile)
+				. ' -env:UserInstallation=file://' . get_temp_dir()
 		;
 		
 		file_put_contents($infile, $input);