diff --git a/functions/system.bash b/functions/system.bash
index 208f7a415..b6d9dd92e 100644
--- a/functions/system.bash
+++ b/functions/system.bash
@@ -23,7 +23,7 @@ system_upgrade() {
   # bad packages may require interactive input despite of this setting so do not mask output (no cond_redirect)
   if ! apt-get upgrade --yes -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold"; then echo "FAILED"; return 1; fi
   if ! cond_redirect java -version &> /dev/null; then
-    if ! java_install "${java_opt:-11}"; then echo "FAILED (install java)"; fi
+    if ! update_config_java "11" && java_install "11"; then echo "FAILED (install java)"; fi
   fi
   unset DEBIAN_FRONTEND
 }