diff --git a/settings.gradle b/settings.gradle
index 75240bee25..0fd80a9c09 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -112,6 +112,7 @@ include ':dd-java-agent:instrumentation:log4j2'
 include ':dd-java-agent:instrumentation:mongo'
 include ':dd-java-agent:instrumentation:mongo:driver-3.1'
 include ':dd-java-agent:instrumentation:mongo:driver-async-3.3'
+include ':dd-java-agent:instrumentation:netty-3.9'
 include ':dd-java-agent:instrumentation:netty-4.0'
 include ':dd-java-agent:instrumentation:netty-4.1'
 include ':dd-java-agent:instrumentation:okhttp-3'