diff --git a/ios/Classes/SwiftAirshipPlugin.swift b/ios/Classes/SwiftAirshipPlugin.swift
index 6b1936a5..1980f4c1 100644
--- a/ios/Classes/SwiftAirshipPlugin.swift
+++ b/ios/Classes/SwiftAirshipPlugin.swift
@@ -452,11 +452,7 @@ public class SwiftAirshipPlugin: NSObject, FlutterPlugin {
             return try AirshipJSON.wrap(flag).unWrap()
 
         case "featureFlagManager#trackInteraction":
-            guard let argument = try? call.requireAnyArg(),
-                  let arg = argument as? String else {
-                throw AirshipErrors.error("Call requires a String argument")
-            }
-
+            let arg = try call.requireStringArg()
             guard let jsonData = arg.data(using: .utf8),
                   let featureFlagProxy = try? JSONDecoder().decode(FeatureFlagProxy.self, from: jsonData) else {
                 throw AirshipErrors.error("Call requires a json string that's decodable to FeatureFlagProxy")