gistfile1.txt

diff --git a/src/scala/compat/java8/JFunction1$mcII$sp.java b/src/scala/compat/java8/JFunction1$mcII$sp.java
index 14fce8a..56eb652 100644
--- a/src/scala/compat/java8/JFunction1$mcII$sp.java
+++ b/src/scala/compat/java8/JFunction1$mcII$sp.java
@@ -5,9 +5,17 @@

 package scala.compat.java8;

+import dotty.runtime.vc.VCIntPrototype;
+
 @FunctionalInterface
 public interface JFunction1$mcII$sp extends JFunction1 {
     abstract int apply$mcII$sp(int v1);

-    default Object apply(Object t) { return (Integer) apply$mcII$sp((Integer) t); }
+    default Object apply(Object t) {
+        int arg = 0;
+        if (t instanceof Integer)
+            arg = (Integer) t;
+        else arg = ((VCIntPrototype) t).underlying();
+
+        return (Integer) apply$mcII$sp(arg); }
 }

ping @VladimirNik