diff --git a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/builtins/IrBuiltInsMapGenerated.kt b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/builtins/IrBuiltInsMapGenerated.kt
index c4c3d8d18df..db0857f5a9d 100644
--- a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/builtins/IrBuiltInsMapGenerated.kt
+++ b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/builtins/IrBuiltInsMapGenerated.kt
@@ -51,6 +51,7 @@ internal fun interpretUnaryFunction(name: String, type: String, a: Any?): Any? {
             "Double" -> return (a as Double).toString()
             "String" -> return (a as String).toString()
             "Any" -> return (a as Any).toString()
+            "Any?" -> return a?.toString() ?: "null"
         }
         "dec" -> when (type) {
             "Char" -> return (a as Char).dec()
diff --git a/generators/interpreter/GenerateInterpreterMap.kt b/generators/interpreter/GenerateInterpreterMap.kt
index d5e0c2db6cb..f2594d5cdf0 100644
--- a/generators/interpreter/GenerateInterpreterMap.kt
+++ b/generators/interpreter/GenerateInterpreterMap.kt
@@ -49,6 +49,7 @@ fun generateMap(): String {
     generateInterpretUnaryFunction(p, getOperationMap(1).apply {
         val irNullCheck = irBuiltIns.checkNotNullSymbol.owner
         this += Operation(irNullCheck.name.asString(), listOf("T0?"), customExpression = "a!!")
+        this += Operation("toString", listOf("Any?"), customExpression = "a?.toString() ?: \"null\"")
     })
 
     generateInterpretBinaryFunction(p, getOperationMap(2) + getBinaryIrOperationMap(irBuiltIns))