diff --git a/lib/asan/tests/test_output.sh b/lib/asan/tests/test_output.sh
index df6847f..0d83a01 100755
--- a/lib/asan/tests/test_output.sh
+++ b/lib/asan/tests/test_output.sh
@@ -7,8 +7,7 @@
 
 for t in  *.tmpl; do
   for b in 32 64; do
-    for O in 1 2 3; do
-      # TODO: reinstate -O0, if that's really needed.
+    for O in 0 1 2 3; do
       c=`basename $t .tmpl`
       c_so=$c-so
       exe=$c.$b.O$O