diff --git a/src/main/scala/leon/termination/StructuralSize.scala b/src/main/scala/leon/termination/StructuralSize.scala
index 610472d92bcd8c43e80235c51b0fb89e9a5354bd..e4b7d42139f5a921c23012c202c7d877422b1803 100644
--- a/src/main/scala/leon/termination/StructuralSize.scala
+++ b/src/main/scala/leon/termination/StructuralSize.scala
@@ -78,8 +78,10 @@ trait StructuralSize {
       }).foldLeft[Expr](InfiniteIntegerLiteral(0))(Plus)
       case IntegerType =>
         FunctionInvocation(typedAbsBigIntFun, Seq(expr)) 
+/*
       case Int32Type =>
         FunctionInvocation(typedAbsIntFun, Seq(expr))
+*/
       case _ => InfiniteIntegerLiteral(0)
     }
   }
diff --git a/src/test/resources/regression/verification/purescala/valid/Nested16.scala b/src/test/resources/regression/verification/purescala/valid/Nested16.scala
new file mode 100644
index 0000000000000000000000000000000000000000..411e4a27f0fb918eba1cd5b8d31131f734d0142b
--- /dev/null
+++ b/src/test/resources/regression/verification/purescala/valid/Nested16.scala
@@ -0,0 +1,17 @@
+/* Copyright 2009-2016 EPFL, Lausanne */
+
+object Nested16 {
+
+  def foo(i: BigInt): BigInt = {
+    def rec1(j: BigInt): BigInt = {
+      require(j >= 0)
+      def rec2(k: BigInt): BigInt = {
+        require(j > 0 || j == k)
+        if(k == 0) 0 else rec1(j-1)
+      }
+      rec2(j)
+    }
+    rec1(3)
+  } ensuring(0 == _)
+
+}