diff --git a/compiler/testData/diagnostics/tests/extensions/GenericIterator.jet b/compiler/testData/diagnostics/tests/extensions/GenericIterator.jet
index 21d20539a15..616bc1a48f5 100644
--- a/compiler/testData/diagnostics/tests/extensions/GenericIterator.jet
+++ b/compiler/testData/diagnostics/tests/extensions/GenericIterator.jet
@@ -1,5 +1,13 @@
+// +JDK
 import java.util.Enumeration
 
+inline fun <T> java.util.Enumeration<T>.iterator() = object: Iterator<T> {
+  override val hasNext: Boolean
+    get() = hasMoreElements()
+
+  override fun next() = nextElement()
+}
+
 fun a(e : java.util.Enumeration<Int>) {
     for (i in e) {
         i : Int
@@ -22,6 +30,6 @@ fun <T : Any> T?.iterator() = object {
 fun main(args : Array<String>) {
   val i : Int? = 1
   for (x in i) {
-    println(x)
+    System.out?.println(x)
   }
 }
\ No newline at end of file