diff --git a/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AdditionalAnnotationsProvider.kt b/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AdditionalAnnotationsProvider.kt
index 4da3857149c..d1def0aad27 100644
--- a/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AdditionalAnnotationsProvider.kt
+++ b/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AdditionalAnnotationsProvider.kt
@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.light.classes.symbol.annotations
 import com.intellij.psi.PsiAnnotation
 import com.intellij.psi.PsiModifierList
 
-internal interface AdditionalAnnotationsProvider {
+internal sealed interface AdditionalAnnotationsProvider {
     fun addAllAnnotations(currentRawAnnotations: MutableList<in PsiAnnotation>, foundQualifiers: MutableSet<String>, owner: PsiModifierList)
     fun findAdditionalAnnotation(annotationsBox: LazyAnnotationsBox, qualifiedName: String, owner: PsiModifierList): PsiAnnotation?
 
diff --git a/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AnnotationsProvider.kt b/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AnnotationsProvider.kt
index b6ff102d3d4..8ee8236ab20 100644
--- a/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AnnotationsProvider.kt
+++ b/analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/annotations/AnnotationsProvider.kt
@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.light.classes.symbol.annotations
 import org.jetbrains.kotlin.analysis.api.annotations.KtAnnotationApplication
 import org.jetbrains.kotlin.name.ClassId
 
-interface AnnotationsProvider {
+internal sealed interface AnnotationsProvider {
     fun classIds(): Collection<ClassId>
     operator fun get(classId: ClassId): Collection<KtAnnotationApplication>
     operator fun contains(classId: ClassId): Boolean