diff --git a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/IrBuiltInsOverFir.kt b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/IrBuiltInsOverFir.kt
index e9953f50c81..ea495aaa55d 100644
--- a/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/IrBuiltInsOverFir.kt
+++ b/compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/IrBuiltInsOverFir.kt
@@ -462,7 +462,7 @@ class IrBuiltInsOverFir(
                 }
 
                 createFunction(
-                    "CHECK_NOT_NULL",
+                    BuiltInOperatorNames.CHECK_NOT_NULL,
                     IrSimpleTypeImpl(typeParameter.symbol, SimpleTypeNullability.DEFINITELY_NOT_NULL, emptyList(), emptyList()),
                     arrayOf("" to IrSimpleTypeImpl(typeParameter.symbol, hasQuestionMark = true, emptyList(), emptyList())),
                     typeParameters = listOf(typeParameter),
diff --git a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/proxy/Proxy.kt b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/proxy/Proxy.kt
index 5cfd3795c33..ad16aa4595c 100644
--- a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/proxy/Proxy.kt
+++ b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/proxy/Proxy.kt
@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.ir.interpreter.proxy
 
+import org.jetbrains.kotlin.ir.BuiltInOperatorNames
+import org.jetbrains.kotlin.ir.IrBuiltIns
 import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.interpreter.CallInterceptor
 import org.jetbrains.kotlin.ir.interpreter.fqName
@@ -15,6 +17,7 @@ import org.jetbrains.kotlin.ir.interpreter.state.*
 import org.jetbrains.kotlin.ir.interpreter.state.reflection.ReflectionState
 import org.jetbrains.kotlin.ir.types.isArray
 import org.jetbrains.kotlin.ir.types.isFloat
+import org.jetbrains.kotlin.name.Name
 import java.lang.invoke.MethodType
 
 internal interface Proxy {
@@ -43,12 +46,15 @@ internal fun State.wrap(callInterceptor: CallInterceptor, remainArraysAsIs: Bool
     }
 }
 
+private val eqeqName = IrBuiltIns.KOTLIN_INTERNAL_IR_FQN.child(Name.identifier(BuiltInOperatorNames.EQEQ)).asString()
+private val checkNotNullName = IrBuiltIns.KOTLIN_INTERNAL_IR_FQN.child(Name.identifier(BuiltInOperatorNames.CHECK_NOT_NULL)).asString()
+
 /**
  * Prepare state object to be passed in outer world
  */
 internal fun List<State>.wrap(callInterceptor: CallInterceptor, irFunction: IrFunction, methodType: MethodType? = null): List<Any?> {
     val name = irFunction.fqName
-    if (name == "kotlin.internal.ir.EQEQ" && this.any { it is Common }) {
+    if (name == eqeqName && this.any { it is Common }) {
         // in case of custom `equals` it is important not to lose information obout type
         // so all states remain as is, only common will be converted to Proxy
         return mapIndexed { index, state ->
@@ -58,7 +64,7 @@ internal fun List<State>.wrap(callInterceptor: CallInterceptor, irFunction: IrFu
     }
     return this.mapIndexed { index, state ->
         // don't get arrays from Primitive in case of "set" and "Pair.<init>"; information about type will be lost
-        val unwrapArrays = (name == "kotlin.Array.set" && index != 0) || name == "kotlin.Pair.<init>" || name == "kotlin.internal.ir.CHECK_NOT_NULL"
+        val unwrapArrays = (name == "kotlin.Array.set" && index != 0) || name == "kotlin.Pair.<init>" || name == checkNotNullName
         state.wrap(callInterceptor, unwrapArrays, methodType?.parameterType(index))
     }
 }
diff --git a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/descriptors/IrBuiltInsOverDescriptors.kt b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/descriptors/IrBuiltInsOverDescriptors.kt
index 478a859d0e8..7926a1fe17a 100644
--- a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/descriptors/IrBuiltInsOverDescriptors.kt
+++ b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/descriptors/IrBuiltInsOverDescriptors.kt
@@ -148,7 +148,7 @@ class IrBuiltInsOverDescriptors(
     }
 
     private fun defineCheckNotNullOperator(): IrSimpleFunctionSymbol {
-        val name = Name.identifier("CHECK_NOT_NULL")
+        val name = Name.identifier(BuiltInOperatorNames.CHECK_NOT_NULL)
         val typeParameterDescriptor: TypeParameterDescriptor
         val valueParameterDescriptor: ValueParameterDescriptor
 
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/IrBuiltIns.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/IrBuiltIns.kt
index 2a144f3f0af..99bc4e05702 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/IrBuiltIns.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/IrBuiltIns.kt
@@ -201,4 +201,5 @@ object BuiltInOperatorNames {
     const val ILLEGAL_ARGUMENT_EXCEPTION = "illegalArgumentException"
     const val ANDAND = "ANDAND"
     const val OROR = "OROR"
+    const val CHECK_NOT_NULL = "CHECK_NOT_NULL"
 }