diff --git a/ios/liblinphone_flutter/Sources/liblinphone_flutter/LiblinphoneFlutterPlugin.swift b/ios/liblinphone_flutter/Sources/liblinphone_flutter/LiblinphoneFlutterPlugin.swift
index bc4db2c..ce21509 100644
--- a/ios/liblinphone_flutter/Sources/liblinphone_flutter/LiblinphoneFlutterPlugin.swift
+++ b/ios/liblinphone_flutter/Sources/liblinphone_flutter/LiblinphoneFlutterPlugin.swift
@@ -170,8 +170,7 @@ public class LiblinphoneFlutterPlugin: NSObject, FlutterPlugin {
 
         case "setMicGain":
             guard let args = call.arguments as? [String: Any],
-                  let levelStr = args["level"] as? String,
-                  let level = Float(levelStr) else {
+                  let level = args["level"] as? Float else {
                 result(FlutterError(code: "INVALID_ARGUMENTS", message: "Missing or invalid 'level'", details: nil))
                 return
             }
@@ -179,12 +178,11 @@ public class LiblinphoneFlutterPlugin: NSObject, FlutterPlugin {
             result(true)
 
         case "getMicGain":
-            result(String(linphoneBridge.getMicGain()))
+            result(linphoneBridge.getMicGain())
 
         case "setPlaybackGain":
             guard let args = call.arguments as? [String: Any],
-                  let levelStr = args["level"] as? String,
-                  let level = Float(levelStr) else {
+                  let level = args["level"] as? Float else {
                 result(FlutterError(code: "INVALID_ARGUMENTS", message: "Missing or invalid 'level'", details: nil))
                 return
             }