diff --git a/tests/build-ci.xml b/tests/build-ci.xml
index aeee9cc8ec56ddb388701b318284b58210373591..a4ce97ac2908093b4086377fb9adc7252b855b75 100644
--- a/tests/build-ci.xml
+++ b/tests/build-ci.xml
@@ -43,7 +43,8 @@
 		<echo>PDO_MYSQL unit tests started</echo>
 
 		<exec executable="phpunit" dir="${basedir}/PHPUnit" failonerror="false" failifexecutionfails="true">
-            <arg line=" --testdox"/>
+            <!-- DEBUG: when test crash in the middle, enable this to see which test crashes -->
+            <!--<arg line=" --testdox"/>-->
 		</exec>
 
 		<echo>PDO_MYSQL unit tests finished</echo>
@@ -61,7 +62,8 @@
 		<echo>MYSQLI unit tests started</echo>
 
 		<exec executable="phpunit" dir="${basedir}/PHPUnit" failonerror="false" failifexecutionfails="true">
-            <arg line=" --testdox"/>
+            <!-- DEBUG: when test crash in the middle, enable this to see which test crashes -->
+            <!--<arg line=" --testdox"/>-->
 		</exec>
 
 		<echo>MYSQLI unit tests finished</echo>