diff --git a/testlib/test/IoTest.kt b/testlib/test/IoTest.kt
index fd673bde1b2..914c41a6d5b 100644
--- a/testlib/test/IoTest.kt
+++ b/testlib/test/IoTest.kt
@@ -19,7 +19,7 @@ class IoTest() : TestSupport() {
   }
   
   fun sample() : Reader {
-    return InputStreamReader(getClass().getClassLoader().getResourceAsStream("test/HelloWorld.txt"))
+    return InputStreamReader((this as java.lang.Object).getClass()?.getClassLoader()?.getResourceAsStream("test/HelloWorld.txt"))
   }
 
   fun testLineIterator() {