diff --git a/core/metadata/src/org/jetbrains/kotlin/metadata/deserialization/BinaryVersion.kt b/core/metadata/src/org/jetbrains/kotlin/metadata/deserialization/BinaryVersion.kt
index ae6661847b7..9375b821953 100644
--- a/core/metadata/src/org/jetbrains/kotlin/metadata/deserialization/BinaryVersion.kt
+++ b/core/metadata/src/org/jetbrains/kotlin/metadata/deserialization/BinaryVersion.kt
@@ -14,7 +14,7 @@ package org.jetbrains.kotlin.metadata.deserialization
  * - Patch version can be increased freely and is only supposed to be used for debugging. Increase the patch version when you
  *   make a change to binaries which is both forward- and backward compatible.
  */
-abstract class BinaryVersion(vararg val numbers: Int) {
+abstract class BinaryVersion(private vararg val numbers: Int) {
     val major: Int = numbers.getOrNull(0) ?: UNKNOWN
     val minor: Int = numbers.getOrNull(1) ?: UNKNOWN
     val patch: Int = numbers.getOrNull(2) ?: UNKNOWN
diff --git a/idea/idea-jvm/src/org/jetbrains/kotlin/idea/versions/UnsupportedAbiVersionNotificationPanelProvider.kt b/idea/idea-jvm/src/org/jetbrains/kotlin/idea/versions/UnsupportedAbiVersionNotificationPanelProvider.kt
index 4b7a3b3cbda..033923ef317 100644
--- a/idea/idea-jvm/src/org/jetbrains/kotlin/idea/versions/UnsupportedAbiVersionNotificationPanelProvider.kt
+++ b/idea/idea-jvm/src/org/jetbrains/kotlin/idea/versions/UnsupportedAbiVersionNotificationPanelProvider.kt
@@ -345,9 +345,11 @@ fun EditorNotificationPanel.createComponentActionLabel(labelText: String, callba
 }
 
 private operator fun BinaryVersion.compareTo(other: BinaryVersion): Int {
-    for (i in 0..Math.max(numbers.size, other.numbers.size) - 1) {
-        val thisPart = numbers.getOrNull(i) ?: -1
-        val otherPart = other.numbers.getOrNull(i) ?: -1
+    val first = this.toArray()
+    val second = other.toArray()
+    for (i in 0 until maxOf(first.size, second.size)) {
+        val thisPart = first.getOrNull(i) ?: -1
+        val otherPart = second.getOrNull(i) ?: -1
 
         if (thisPart != otherPart) {
             return thisPart - otherPart