diff --git a/libraries-concurrency/pom.xml b/libraries-concurrency/pom.xml
index 7ae834025f..cb59b17674 100644
--- a/libraries-concurrency/pom.xml
+++ b/libraries-concurrency/pom.xml
@@ -14,7 +14,7 @@
     </parent>
 
     <modules>
-        <module>coroutines-with-quasar</module>
+        <!-- <module>coroutines-with-quasar</module>  --><!-- we haven't upgraded to Java 12 -->
     </modules>
 
 </project>
\ No newline at end of file