diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsTransformer.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsTransformer.kt
index d365396c02f..c5296dd5079 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsTransformer.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirSealedClassInheritorsTransformer.kt
@@ -91,7 +91,10 @@ class FirSealedClassInheritorsTransformer : FirTransformer<Nothing?>() {
             val classLikeSymbol: FirClassifierSymbol<*> = symbolProvider.getSymbolByLookupTag(lookupTag) ?: return null
             return when (classLikeSymbol) {
                 is FirRegularClassSymbol -> classLikeSymbol.fir
-                is FirTypeAliasSymbol -> extractClassFromTypeRef(symbolProvider, classLikeSymbol.fir.expandedTypeRef)
+                is FirTypeAliasSymbol -> {
+                    classLikeSymbol.ensureResolved(FirResolvePhase.SUPER_TYPES, symbolProvider.session)
+                    extractClassFromTypeRef(symbolProvider, classLikeSymbol.fir.expandedTypeRef)
+                }
                 else -> null
             }
         }