diff --git a/platform/syntax/syntax-api/src/com/intellij/platform/syntax/impl/builder/ParsingTreeBuilder.kt b/platform/syntax/syntax-api/src/com/intellij/platform/syntax/impl/builder/ParsingTreeBuilder.kt
index 9f81448595e1..cf713bf97463 100644
--- a/platform/syntax/syntax-api/src/com/intellij/platform/syntax/impl/builder/ParsingTreeBuilder.kt
+++ b/platform/syntax/syntax-api/src/com/intellij/platform/syntax/impl/builder/ParsingTreeBuilder.kt
@@ -410,11 +410,11 @@ internal class ParsingTreeBuilder(
       get() = tokens
 
     override fun copyTokenStartsToArray(dest: IntArray, srcStart: Int, destStart: Int, length: Int) {
-      System.arraycopy(myLexStarts, srcStart, dest, destStart, length)
+      myLexStarts.copyInto(dest, destStart, srcStart, srcStart + length)
     }
 
     override fun copyTokenTypesToArray(dest: Array<in SyntaxElementType>, srcStart: Int, destStart: Int, length: Int) {
-      System.arraycopy(myLexTypes, srcStart, dest, destStart, length)
+      myLexTypes.copyInto(dest, destStart,  srcStart, srcStart + length)
     }
   }