diff --git a/library/par/package.scala b/library/par/package.scala
index 4690eddbff16d5c756335195ed1c1ed9193833f5..6e8d1d571b8b21f63a725353a4db30ee92fdeb0d 100644
--- a/library/par/package.scala
+++ b/library/par/package.scala
@@ -9,6 +9,7 @@ import leon.lang.synthesis.choose
 package object par {
 
   // @library
+  @inline
   def parallel[A,B](x: => A, y: => B) : (A,B) = {
     (x,y)
   }
diff --git a/testcases/verification/list-algorithms/BasicMergeSort.scala b/testcases/verification/list-algorithms/BasicMergeSort.scala
index 474f768a5a10b32eec99e6eebacfd3680d6ccda2..55e632ff8f68307ba24cff691bde6b45fa206842 100644
--- a/testcases/verification/list-algorithms/BasicMergeSort.scala
+++ b/testcases/verification/list-algorithms/BasicMergeSort.scala
@@ -18,7 +18,8 @@ object MergeSort {
   def msort[T](less: (T, T) => Boolean)(l: List[T]): List[T] = {
     if (l.size <= 1) l
     else {
-      val (first, second) = l.evenSplit
+      val c = l.length/2
+      val (first, second) = l.splitAtIndex(c) // evenSplit
       merge(less)(msort(less)(first), msort(less)(second))
     }
   } ensuring { res => res.content == l.content && res.size == l.size }
diff --git a/testcases/verification/list-algorithms/BasicMergeSortPar.scala b/testcases/verification/list-algorithms/BasicMergeSortPar.scala
index e5620482d87cd48dee2fe74f7c2e1bcda5b473df..493122b2f8d0cc6356ef76b3ba6cfaf33e66c38a 100644
--- a/testcases/verification/list-algorithms/BasicMergeSortPar.scala
+++ b/testcases/verification/list-algorithms/BasicMergeSortPar.scala
@@ -19,9 +19,11 @@ object MergeSortPar {
   def msort[T](less: (T, T) => Boolean)(l: List[T]): List[T] = {
     if (l.size <= 1) l
     else {
-      val (first, second) = l.evenSplit
+      val c = l.length/2
+      val (first, second) = l.splitAtIndex(c) // evenSplit
       val (s1, s2) = parallel(msort(less)(first), msort(less)(second))
       merge(less)(s1, s2)
     }
-  } ensuring { res => res.content == l.content && res.size == l.size }
+  } ensuring { res => res.content == l.content && 
+                      res.size == l.size }
 }