diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrSymbol.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrSymbol.kt
index 2a21374dd08..2d366248f21 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrSymbol.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/IrSymbol.kt
@@ -54,7 +54,7 @@ interface IrBindableSymbol<out D : DeclarationDescriptor, B : IrSymbolOwner> : I
     fun bind(owner: B)
 }
 
-interface IrPackageFragmentSymbol : IrSymbol {
+sealed interface IrPackageFragmentSymbol : IrSymbol {
     @ObsoleteDescriptorBasedAPI
     override val descriptor: PackageFragmentDescriptor
 }