diff --git a/src/freedombone-controlpanel b/src/freedombone-controlpanel
index 776ed05c..a8da60a7 100755
--- a/src/freedombone-controlpanel
+++ b/src/freedombone-controlpanel
@@ -1817,7 +1817,7 @@ function performance_benchmarks {
     fi
     echo ''
     echo $"Testing read speed of drive $test_drive"
-    hdparm -t $test_drive
+    hdparm -tT $test_drive
     any_key
 }