diff --git a/rxjava-contrib/rxjava-quasar/build.gradle b/rxjava-contrib/rxjava-quasar/build.gradle
index fdcac9663f..c7fd1dbb83 100644
--- a/rxjava-contrib/rxjava-quasar/build.gradle
+++ b/rxjava-contrib/rxjava-quasar/build.gradle
@@ -32,9 +32,11 @@ jar {
 }
 
 tasks.withType(Test) {
+    // systemProperty 'co.paralleluniverse.fibers.verifyInstrumentation', 'true'
     jvmArgs "-javaagent:${configurations.quasar.iterator().next()}" // =vdmc (verbose, debug, allow monitors, check class)
 }
 
 tasks.withType(JavaExec) {
+    // systemProperty 'co.paralleluniverse.fibers.verifyInstrumentation', 'true'
     jvmArgs "-javaagent:${configurations.quasar.iterator().next()}" // =vdmc (verbose, debug, allow monitors, check class)
 }
diff --git a/rxjava-contrib/rxjava-quasar/src/main/resources/META-INF/suspendables b/rxjava-contrib/rxjava-quasar/src/main/resources/META-INF/suspendables
index d364ba2406..bcdf11a8d3 100644
--- a/rxjava-contrib/rxjava-quasar/src/main/resources/META-INF/suspendables
+++ b/rxjava-contrib/rxjava-quasar/src/main/resources/META-INF/suspendables
@@ -1 +1,2 @@
 rx.Observable.subscribe
+rx.Observable$2.call