diff --git a/src/plugins/plugin_misc_file.py b/src/plugins/plugin_misc_file.py
index abd1e131..5600e114 100644
--- a/src/plugins/plugin_misc_file.py
+++ b/src/plugins/plugin_misc_file.py
@@ -97,7 +97,10 @@ class SatFile(object):
         return self._file.tell()
 
     def getProgress(self, progress_id, profile):
-        return {'position': self._file.tell(), 'size': self.size or -1}
+        ret = {'position': self._file.tell()}
+        if self.size:
+            ret['size'] = self.size
+        return ret
 
 
 class FilePlugin(object):