diff --git a/Sources/OpenWeatherKit/Internal/Models/APIForecastDaily.swift b/Sources/OpenWeatherKit/Internal/Models/APIForecastDaily.swift
index 6733af6..3a3d8fd 100644
--- a/Sources/OpenWeatherKit/Internal/Models/APIForecastDaily.swift
+++ b/Sources/OpenWeatherKit/Internal/Models/APIForecastDaily.swift
@@ -28,7 +28,7 @@ struct APIDay: Codable, Equatable {
     let maxUvIndex: Int
     let moonPhase: String
     let moonrise: Date?
-    let moonset: Date
+    let moonset: Date?
     let precipitationAmount: Double
     let precipitationChance: Double
     let precipitationType: String