diff --git a/ts3-client/README.md b/ts3-client/README.md
index 0ce1d36..9d2d3fd 100644
--- a/ts3-client/README.md
+++ b/ts3-client/README.md
@@ -189,11 +189,11 @@ frontend supplies its own UI and audio backend while reusing `core` unchanged.
   - macOS: `brew install opus`
 
 ## Building
-The client depends on `ts3j`, so install that into your local Maven repo first:
+The build compiles `ts3j` from `../ts3j` alongside the client, so make sure the submodule is
+checked out (`git submodule update --init`):
 
 ```bash
-cd ../ts3j && mvn -DskipTests install
-cd ../ts3-client && mvn -DskipTests package
+mvn -DskipTests package
 ```
 
 This produces a runnable fat-jar at `swing/target/ts3-client.jar`.
diff --git a/ts3-client/pom.xml b/ts3-client/pom.xml
index ddfda81..11ce26d 100644
--- a/ts3-client/pom.xml
+++ b/ts3-client/pom.xml
@@ -13,6 +13,8 @@
     <description>Desktop TeamSpeak 3 client built on the ts3j protocol library</description>
 
     <modules>
+        <!-- Build ts3j from source so a stale copy in ~/.m2 can never end up in the client. -->
+        <module>../ts3j</module>
         <module>core</module>
         <module>desktop</module>
         <module>swing</module>