diff --git a/VAX/tests/vax-diag_test.ini b/VAX/tests/vax-diag_test.ini
index 317306cf..320fcf9c 100644
--- a/VAX/tests/vax-diag_test.ini
+++ b/VAX/tests/vax-diag_test.ini
@@ -18,8 +18,8 @@
 ::
 #set debug -nrtbp 500 %SIM_BIN_NAME%.dbg
 #set log debug
-set todr debug
-set tmr debug
+if device todr set todr debug
+if device tmr set tmr debug
 set int-clock debug=calib
 set int-clock nodebug=queue;gettime;check
 #set -o -t cpu hist=500k:%SIM_BIN_NAME%.hst