diff --git a/compiler/ir/ir.tree.persistent/generator/src/org/jetbrains/kotlin/ir/persistentIrGenerator/PersistentIrGenerator.kt b/compiler/ir/ir.tree.persistent/generator/src/org/jetbrains/kotlin/ir/persistentIrGenerator/PersistentIrGenerator.kt
index 95a0701bf16..dd2d105c223 100644
--- a/compiler/ir/ir.tree.persistent/generator/src/org/jetbrains/kotlin/ir/persistentIrGenerator/PersistentIrGenerator.kt
+++ b/compiler/ir/ir.tree.persistent/generator/src/org/jetbrains/kotlin/ir/persistentIrGenerator/PersistentIrGenerator.kt
@@ -709,3 +709,5 @@ internal object PersistentIrGenerator {
         })
     }
 }
+
+private fun String.capitalize(): String = replaceFirstChar { if (it.isLowerCase()) it.titlecase() else it.toString() }
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