diff --git a/runtime/src/main/kotlin/kotlin/String.kt b/runtime/src/main/kotlin/kotlin/String.kt
index 74ff0defbdd..d4aa02b409b 100644
--- a/runtime/src/main/kotlin/kotlin/String.kt
+++ b/runtime/src/main/kotlin/kotlin/String.kt
@@ -59,7 +59,7 @@ public final class String : Comparable<String>, CharSequence {
 private val kNullString = "null"
 
 public operator fun kotlin.String?.plus(other: kotlin.Any?): kotlin.String =
-    this?.plus(other?.toString() ?: kNullString) ?: other?.toString() ?: kNullString
+    (this?.toString() ?: kNullString).plus(other?.toString() ?: kNullString)
 
 
 public fun Any?.toString() = this?.toString() ?: kNullString
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