diff --git a/iis-wf/iis-wf-affmatching/src/test/resources/log4j.properties b/iis-wf/iis-wf-affmatching/src/test/resources/log4j.properties
index 80c17380a..302650e93 100644
--- a/iis-wf/iis-wf-affmatching/src/test/resources/log4j.properties
+++ b/iis-wf/iis-wf-affmatching/src/test/resources/log4j.properties
@@ -7,3 +7,4 @@ log4j.appender.console.layout=org.apache.log4j.PatternLayout
 log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}: %m%n
 
 log4j.logger.eu.dnetlib.iis=DEBUG
+log4j.logger.eu.dnetlib.iis.wf.affmatching.match.voter=TRACE
\ No newline at end of file