diff --git a/.forgejo/workflows/build-apk.yml b/.forgejo/workflows/build-apk.yml
index 6e34f9c..1e02585 100644
--- a/.forgejo/workflows/build-apk.yml
+++ b/.forgejo/workflows/build-apk.yml
@@ -35,6 +35,10 @@ jobs:
     env:
       GRADLE_USER_HOME: /opt/cache/gradle
       npm_config_cache: /opt/cache/npm
+      # Applies to EVERY JVM the build spawns (Gradle workers, artifact transforms,
+      # Kotlin daemon) — the runner container has no IPv6 route, so without this the
+      # transform workers try dl.google.com over IPv6 and get "Network is unreachable".
+      JAVA_TOOL_OPTIONS: "-Djava.net.preferIPv4Stack=true"
     steps:
       - uses: actions/checkout@v4