diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java b/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java
index 2a100061d2f..63177c1b26e 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/utils/JsDescriptorUtils.java
@@ -120,7 +120,8 @@ public final class JsDescriptorUtils {
             declarationDescriptor = ((ThisReceiver) receiverParameter).getDeclarationDescriptor();
         }
         else {
-            throw new UnsupportedOperationException("Unsupported receiver type: " + receiverParameter);
+            throw new UnsupportedOperationException("Unsupported receiver type: " + receiverParameter.getClass() +
+                                                    ", receiverParameter = " + receiverParameter);
         }
 
         return declarationDescriptor.getOriginal();