diff --git a/glances_api/__init__.py b/glances_api/__init__.py
index 570bb0d..6e727ca 100644
--- a/glances_api/__init__.py
+++ b/glances_api/__init__.py
@@ -112,6 +112,7 @@ async def get_ha_sensor_data(self) -> dict[str, Any]:
                 sensor_data["fs"][disk["mnt_point"]] = {
                     "disk_use": round(disk["used"] / 1024**3, 1),
                     "disk_use_percent": disk["percent"],
+                    "disk_size": round(disk["size"] / 1024**3, 1),
                     "disk_free": round(disk_free / 1024**3, 1),
                 }
         if data := self.data.get("sensors"):
diff --git a/tests/test_responses.py b/tests/test_responses.py
index f408246..16fffc9 100644
--- a/tests/test_responses.py
+++ b/tests/test_responses.py
@@ -276,8 +276,8 @@
 
 HA_SENSOR_DATA: dict[str, Any] = {
     "fs": {
-        "/ssl": {"disk_use": 30.7, "disk_use_percent": 6.7, "disk_free": 426.5},
-        "/media": {"disk_use": 30.7, "disk_use_percent": 6.7, "disk_free": 426.5},
+        "/ssl": {"disk_use": 30.7, "disk_use_percent": 6.7, "disk_free": 426.5, "disk_size": 476.2},
+        "/media": {"disk_use": 30.7, "disk_use_percent": 6.7, "disk_free": 426.5, "disk_size": 476.2},
     },
     "sensors": {"cpu_thermal 1": {"temperature_core": 59}},
     "mem": {