diff -r 7865a00c30ef -r c3dee54ecc15 rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionTest.java
--- a/rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionTest.java	Sun Mar 20 09:25:47 2016 +0100
+++ b/rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionTest.java	Sun Mar 20 15:26:19 2016 +0100
@@ -75,6 +75,10 @@
         return Runnable.class.getMethod("run").getName();
     }
 
+    @Compare public boolean RunnableRunReturnsVoid() throws NoSuchMethodException {
+        return Runnable.class.getMethod("run").getReturnType() == Void.TYPE;
+    }
+
     @Compare public String isRunnableDeclaresRunMethod() throws NoSuchMethodException {
         return Runnable.class.getDeclaredMethod("run").getName();
     }