diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/text/Char.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/text/Char.kt
index 887535cfef5..b875c8c6d34 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/text/Char.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/text/Char.kt
@@ -139,6 +139,7 @@ public actual fun Char.isLowerCase(): Boolean {
  *
  * @sample samples.text.Chars.isTitleCase
  */
+@SinceKotlin("1.5")
 public actual fun Char.isTitleCase(): Boolean {
     if (this < '\u0080') {
         return false