diff --git a/core-kotlin/src/main/kotlin/com/baeldung/operators/Money.kt b/core-kotlin/src/main/kotlin/com/baeldung/operators/Money.kt
index ffaea71e1e..1bb015ac27 100644
--- a/core-kotlin/src/main/kotlin/com/baeldung/operators/Money.kt
+++ b/core-kotlin/src/main/kotlin/com/baeldung/operators/Money.kt
@@ -1,3 +1,5 @@
+import java.math.BigDecimal
+
 enum class Currency {
     DOLLARS, EURO
 }
diff --git a/core-kotlin/src/main/kotlin/com/baeldung/operators/Utils.kt b/core-kotlin/src/main/kotlin/com/baeldung/operators/Utils.kt
index a3c671369c..ba33d3e7a2 100644
--- a/core-kotlin/src/main/kotlin/com/baeldung/operators/Utils.kt
+++ b/core-kotlin/src/main/kotlin/com/baeldung/operators/Utils.kt
@@ -1,3 +1,5 @@
+import java.math.BigInteger
+
 operator fun <T> MutableCollection<T>.plusAssign(element: T) {
     add(element)
 }