diff --git a/Sources/IoT-Simulator-Core/IoT_Simulator_Core.swift b/Sources/IoT-Simulator-Core/IoT_Simulator_Core.swift
index c3c4b3d..b1476bd 100644
--- a/Sources/IoT-Simulator-Core/IoT_Simulator_Core.swift
+++ b/Sources/IoT-Simulator-Core/IoT_Simulator_Core.swift
@@ -17,7 +17,7 @@ public actor IoTSimulatorCore {
     public static func addDevice(
         location: String,
         device: EdgeDeviceP,
-        success: sending @escaping (_ msg: Data) throws -> Void,
+        success: sending @escaping (_ msg: Data) async throws -> Void,
         failure: sending @escaping () -> Void
     ) throws {
         if let environment = IoTSimulatorCore.enviroments[location] {