diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
index b562c1bcf27..0cdc031a164 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
@@ -350,6 +350,12 @@ class ExpressionCodegen(
                 generateAsCast(mv, expression.typeOperand, boxType(expression.typeOperand.asmType), expression.operator == IrTypeOperator.SAFE_CAST)
             }
 
+            IrTypeOperator.INSTANCEOF -> {
+                gen(expression.argument, OBJECT_TYPE, data)
+                val type = boxType(expression.typeOperand.asmType)
+                generateIsCheck(mv, expression.typeOperand, type)
+            }
+
             else -> super.visitTypeOperator(expression, data)
         }
         return expression.onStack