diff --git a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrInterpreterCommonChecker.kt b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrInterpreterCommonChecker.kt
index 063e09e5fff..286c52a3d20 100644
--- a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrInterpreterCommonChecker.kt
+++ b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/checker/IrInterpreterCommonChecker.kt
@@ -119,11 +119,6 @@ class IrInterpreterCommonChecker : IrInterpreterChecker {
         return body.kind == IrSyntheticBodyKind.ENUM_VALUES || body.kind == IrSyntheticBodyKind.ENUM_VALUEOF
     }
 
-    private fun IrConst<*>.isNaN(): Boolean {
-        return this.kind == IrConstKind.Double && IrConstKind.Double.valueOf(this).isNaN() ||
-                this.kind == IrConstKind.Float && IrConstKind.Float.valueOf(this).isNaN()
-    }
-
     override fun visitConst(expression: IrConst<*>, data: IrInterpreterCheckerData): Boolean {
         return true
     }