diff --git a/src/lib/converter/context.ts b/src/lib/converter/context.ts
index 70f7917e2..b3eca2679 100644
--- a/src/lib/converter/context.ts
+++ b/src/lib/converter/context.ts
@@ -410,7 +410,7 @@ export class Context {
 
 function isNamedNode(node: ts.Node): node is ts.Node & { name: ts.Identifier | ts.PrivateIdentifier | ts.ComputedPropertyName } {
     return node['name'] && (
-        ts.isIdentifierOrPrivateIdentifier(node['name']) ||
+        ts.isIdentifierOrPrivateIdentifier && ts.isIdentifierOrPrivateIdentifier(node['name']) ||
         ts.isComputedPropertyName(node['name'])
     );
 }
diff --git a/src/lib/converter/types/tuple.ts b/src/lib/converter/types/tuple.ts
index 53ffd9514..2cb36817c 100644
--- a/src/lib/converter/types/tuple.ts
+++ b/src/lib/converter/types/tuple.ts
@@ -74,7 +74,7 @@ export class TupleConverter extends ConverterTypeComponent implements TypeConver
 @Component({ name: 'type:named-tuple-member' })
 export class NamedTupleMemberConverter extends ConverterTypeComponent implements TypeNodeConverter<ts.Type, ts.NamedTupleMember> {
     supportsNode(_context: Context, node: ts.Node) {
-        return ts.isNamedTupleMember(node);
+        return ts.isNamedTupleMember && ts.isNamedTupleMember(node);
     }
 
     convertNode(context: Context, node: ts.NamedTupleMember): NamedTupleMember | undefined {