diff --git a/src-python/controller.py b/src-python/controller.py
index f0356287..258b7f5b 100644
--- a/src-python/controller.py
+++ b/src-python/controller.py
@@ -150,7 +150,7 @@ class Controller:
                 400,
                 self.run_mapping["error_device"],
                 {
-                    "message":"No Speaker device detected",
+                    "message":"No speaker device detected",
                     "data": None
                 },
             )
diff --git a/src-ui/logics/_useBackendErrorHandling.js b/src-ui/logics/_useBackendErrorHandling.js
index 1145cd80..e76e486a 100644
--- a/src-ui/logics/_useBackendErrorHandling.js
+++ b/src-ui/logics/_useBackendErrorHandling.js
@@ -44,7 +44,7 @@ export const _useBackendErrorHandling = () => {
             case "No mic device detected":
                 showNotification_Error(t("common_error.no_device_mic"));
                 break;
-            case "No Speaker device detected":
+            case "No speaker device detected":
                 showNotification_Error(t("common_error.no_device_speaker"));
                 break;