diff --git a/logback-classic/src/test/input/fqcn.txt b/logback-classic/src/test/input/fqcn.txt
index a0234a76df..98ee2825c2 100644
--- a/logback-classic/src/test/input/fqcn.txt
+++ b/logback-classic/src/test/input/fqcn.txt
@@ -224,6 +224,7 @@ ch.qos.logback.classic.pattern.RootCauseFirstThrowableProxyConverter
 ch.qos.logback.classic.pattern.SyslogStartConverter
 ch.qos.logback.classic.pattern.TargetLengthBasedClassNameAbbreviator
 ch.qos.logback.classic.pattern.ThreadConverter
+ch.qos.logback.classic.pattern.ThreadIdConverter
 ch.qos.logback.classic.pattern.ThrowableHandlingConverter
 ch.qos.logback.classic.pattern.ThrowableProxyConverter
 ch.qos.logback.classic.pattern.Util