diff --git a/idea/src/org/jetbrains/kotlin/idea/refactoring/rename/KotlinDeclarationRenameInputValidator.kt b/idea/src/org/jetbrains/kotlin/idea/refactoring/rename/KotlinDeclarationRenameInputValidator.kt
index b6199494f29..f09c73f45b5 100644
--- a/idea/src/org/jetbrains/kotlin/idea/refactoring/rename/KotlinDeclarationRenameInputValidator.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/refactoring/rename/KotlinDeclarationRenameInputValidator.kt
@@ -27,7 +27,7 @@ import org.jetbrains.kotlin.psi.KtNamedDeclaration
 class KotlinDeclarationRenameInputValidator : RenameInputValidator {
     override fun getPattern() = PlatformPatterns.psiElement(KtNamedDeclaration::class.java)
 
-    override fun isInputValid(newName: String?, element: PsiElement?, context: ProcessingContext?): Boolean {
-        return newName != null && KotlinNameSuggester.isIdentifier(newName.quoteIfNeeded())
+    override fun isInputValid(newName: String, element: PsiElement, context: ProcessingContext): Boolean {
+        return KotlinNameSuggester.isIdentifier(newName.quoteIfNeeded())
     }
 }