diff --git a/homeassistant/components/fritzbox/strings.json b/homeassistant/components/fritzbox/strings.json
index c7c2439b566..e0df30875bc 100644
--- a/homeassistant/components/fritzbox/strings.json
+++ b/homeassistant/components/fritzbox/strings.json
@@ -89,7 +89,7 @@
       "message": "Can't change preset while holiday or summer mode is active on the device."
     },
     "change_hvac_while_active_mode": {
-      "message": "Can't change hvac mode while holiday or summer mode is active on the device."
+      "message": "Can't change HVAC mode while holiday or summer mode is active on the device."
     }
   }
 }
diff --git a/tests/components/fritzbox/test_climate.py b/tests/components/fritzbox/test_climate.py
index f170836fa9b..0784d7b6188 100644
--- a/tests/components/fritzbox/test_climate.py
+++ b/tests/components/fritzbox/test_climate.py
@@ -528,7 +528,7 @@ async def test_holidy_summer_mode(
 
     with pytest.raises(
         HomeAssistantError,
-        match="Can't change hvac mode while holiday or summer mode is active on the device",
+        match="Can't change HVAC mode while holiday or summer mode is active on the device",
     ):
         await hass.services.async_call(
             "climate",
@@ -564,7 +564,7 @@ async def test_holidy_summer_mode(
 
     with pytest.raises(
         HomeAssistantError,
-        match="Can't change hvac mode while holiday or summer mode is active on the device",
+        match="Can't change HVAC mode while holiday or summer mode is active on the device",
     ):
         await hass.services.async_call(
             "climate",