diff --git a/tests/src/test/scala/scalaz/ReaderWriterStateTTest.scala b/tests/src/test/scala/scalaz/ReaderWriterStateTTest.scala
index 73544c5eb5..97996884cf 100644
--- a/tests/src/test/scala/scalaz/ReaderWriterStateTTest.scala
+++ b/tests/src/test/scala/scalaz/ReaderWriterStateTTest.scala
@@ -27,8 +27,8 @@ object ReaderWriterStateTTest extends SpecLite {
 
   "ReaderWriterStateT can be trampolined without stack overflow" in {
     import scalaz.Free._
-    val result = (0 to 10000).toList.map(ii => ReaderWriterStateT[String, Int, Unit, Trampoline, Int]((_, i: Int) => Trampoline.done(("", i, ii))))
-      .foldLeft(ReaderWriterStateT[String, Int, Unit, Trampoline, Int]((_, i: Int) => Trampoline.done(("", i, i))))( (a, b) => a.flatMap(_ => b))
+    val result = (0 to 10000).toList.map(ii => ReaderWriterStateT[Unit, String, Int, Trampoline, Int]((_, i: Int) => Trampoline.done(("", i, ii))))
+      .foldLeft(ReaderWriterStateT[Unit, String, Int, Trampoline, Int]((_, i: Int) => Trampoline.done(("", i, i))))( (a, b) => a.flatMap(_ => b))
     10000 must_=== result.run((),0).run._3
   }