diff --git a/data/shared/src/main/scala/sigma/ast/methods.scala b/data/shared/src/main/scala/sigma/ast/methods.scala
index 5b235d3638..ebce47547d 100644
--- a/data/shared/src/main/scala/sigma/ast/methods.scala
+++ b/data/shared/src/main/scala/sigma/ast/methods.scala
@@ -309,9 +309,6 @@ case object SBigIntMethods extends SNumericTypeMethods {
   /** Type for which this container defines methods. */
   override def ownerType: SMonoType = SBigInt
 
-  final val ToNBitsCostInfo = OperationCostInfo(
-    FixedCost(JitCost(5)), NamedDesc("NBitsMethodCall"))
-
   /** The following `modQ` methods are not fully implemented in v4.x and this descriptors.
     * This descritors are remain here in the code and are waiting for full implementation
     * is upcoming soft-forks at which point the cost parameters should be calculated and
diff --git a/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala b/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala
index 62207088da..d80e39273f 100644
--- a/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala
+++ b/sc/shared/src/test/scala/sigmastate/utxo/BasicOpsSpecification.scala
@@ -794,8 +794,7 @@ class BasicOpsSpecification extends CompilerTestingCommons
     def getRegTest(): Assertion = {
       test("Box.getReg", env, ext,
         """{
-          |   val idx = getVar[Int](1).get
-          |   val x = SELF.getReg[Long](idx).get
+          |   val x = SELF.getReg[Long](getVar[Int](1).get).get
           |   x == SELF.value
           |}""".stripMargin,
         null