--- a/testing/mozharness/scripts/desktop_unittest.py
+++ b/testing/mozharness/scripts/desktop_unittest.py
@@ -717,17 +717,17 @@ class DesktopUnittest(TestingMixin, Merc
             import psutil
             dir = self.query_abs_dirs()['abs_blob_upload_dir']
             self.mkdir_p(dir)
             path = os.path.join(dir, "system-info.log")
             with open(path, "w") as f:
                 f.write("System info collected at %s\n\n" % datetime.now())
                 f.write("\nBoot time %s\n" % datetime.fromtimestamp(psutil.boot_time()))
                 f.write("\nVirtual memory: %s\n" % str(psutil.virtual_memory()))
-                f.write("\nDisk partitions: %s\n" % str(psutil.disk_partitions()))
+                f.write("\nDisk partitions: %s\n" % str(psutil.disk_partitions(True)))
                 f.write("\nDisk usage (/): %s\n" % str(psutil.disk_usage(os.path.sep)))
                 if not self._is_windows():
                     # bug 1417189: frequent errors querying users on Windows
                     f.write("\nUsers: %s\n" % str(psutil.users()))
                 f.write("\nNetwork connections:\n")
                 try:
                     for nc in psutil.net_connections():
                         f.write("  %s\n" % str(nc))