diff --git a/Examples/LocalizedStringApp/LocalizedStringAppTests/LocalizedStringAppTests.swift b/Examples/LocalizedStringApp/LocalizedStringAppTests/LocalizedStringAppTests.swift
index a180e156..b0a94705 100644
--- a/Examples/LocalizedStringApp/LocalizedStringAppTests/LocalizedStringAppTests.swift
+++ b/Examples/LocalizedStringApp/LocalizedStringAppTests/LocalizedStringAppTests.swift
@@ -208,6 +208,12 @@ class LocalizedStringAppTests: XCTestCase {
       R.string.ten.ten1(things: 1),
       String(format: NSLocalizedString("ten1", tableName: "ten", comment: ""), 1)
     )
+
+    /* default preferred language */
+    XCTAssertEqual(
+      R.string(preferredLanguages: nil).one.one1(),
+      NSLocalizedString("one1", tableName: "one", comment: "")
+    )
   }
 
 
diff --git a/Sources/RswiftGenerators/StringsTable+Generator.swift b/Sources/RswiftGenerators/StringsTable+Generator.swift
index 9073b273..395750e5 100644
--- a/Sources/RswiftGenerators/StringsTable+Generator.swift
+++ b/Sources/RswiftGenerators/StringsTable+Generator.swift
@@ -47,7 +47,7 @@ extension Struct {
             deploymentTarget: deploymentTarget,
             name: SwiftIdentifier(name: name),
             params: [
-                .init(name: "preferredLanguages", localName: nil, typeReference: .init(module: .stdLib, rawName: "[String]"), defaultValue: nil),
+                .init(name: "preferredLanguages", localName: nil, typeReference: .init(module: .stdLib, rawName: "[String]?"), defaultValue: "nil"),
                 .init(name: "locale", localName: nil, typeReference: .init(module: .stdLib, rawName: "Locale?"), defaultValue: "nil")
             ],
             returnType: TypeReference(module: .host, rawName: self.name.value),