diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/AbstractConeCallConflictResolver.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/AbstractConeCallConflictResolver.kt
index f3f700736b5..3504b0bd341 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/AbstractConeCallConflictResolver.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/AbstractConeCallConflictResolver.kt
@@ -104,6 +104,7 @@ abstract class AbstractConeCallConflictResolver(
             is FirConstructor -> createFlatSignature(call, declaration)
             is FirVariable<*> -> createFlatSignature(call, declaration)
             is FirClass<*> -> createFlatSignature(call, declaration)
+            is FirTypeAlias -> createFlatSignature(call, declaration)
             else -> error("Not supported: $declaration")
         }
     }
@@ -163,10 +164,10 @@ abstract class AbstractConeCallConflictResolver(
                     ?: call.argumentMapping?.map { it.value.argumentType() }.orEmpty())
     }
 
-    private fun createFlatSignature(call: Candidate, klass: FirClass<*>): FlatSignature<Candidate> {
+    private fun createFlatSignature(call: Candidate, klass: FirClassLikeDeclaration<*>): FlatSignature<Candidate> {
         return FlatSignature(
             call,
-            (klass as? FirRegularClass)?.typeParameters?.map { it.symbol.toLookupTag() }.orEmpty(),
+            (klass as? FirTypeParameterRefsOwner)?.typeParameters?.map { it.symbol.toLookupTag() }.orEmpty(),
             valueParameterTypes = emptyList(),
             hasExtensionReceiver = false,
             hasVarargs = false,