diff --git a/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt b/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt
index 9df05672e22..25b02c9b34f 100644
--- a/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt
+++ b/compiler/fir/fir-serialization/src/org/jetbrains/kotlin/fir/serialization/FirElementSerializer.kt
@@ -65,6 +65,7 @@ class FirElementSerializer private constructor(
             when (declaration) {
                 is FirProperty -> propertyProto(declaration)?.let { builder.addProperty(it) }
                 is FirSimpleFunction -> functionProto(declaration)?.let { builder.addFunction(it) }
+                is FirTypeAlias -> typeAliasProto(declaration)?.let { builder.addTypeAlias(it) }
             }
         }