diff --git a/homeassistant/components/smartthings/light.py b/homeassistant/components/smartthings/light.py
index 9ec4634ab36eed..4bc3f4877907a4 100644
--- a/homeassistant/components/smartthings/light.py
+++ b/homeassistant/components/smartthings/light.py
@@ -133,7 +133,9 @@ async def async_update(self):
         """Update entity attributes when the device status has changed."""
         # Brightness and transition
         if self._supported_features & SUPPORT_BRIGHTNESS:
-            self._brightness = convert_scale(self._device.status.level, 100, 255)
+            self._brightness = int(
+                convert_scale(self._device.status.level, 100, 255, 0)
+            )
         # Color Temperature
         if self._supported_features & SUPPORT_COLOR_TEMP:
             self._color_temp = color_util.color_temperature_kelvin_to_mired(
diff --git a/tests/components/smartthings/test_light.py b/tests/components/smartthings/test_light.py
index b0f7268217c548..e9004031e7d286 100644
--- a/tests/components/smartthings/test_light.py
+++ b/tests/components/smartthings/test_light.py
@@ -84,6 +84,7 @@ async def test_entity_state(hass, light_devices):
         state.attributes[ATTR_SUPPORTED_FEATURES]
         == SUPPORT_BRIGHTNESS | SUPPORT_TRANSITION
     )
+    assert isinstance(state.attributes[ATTR_BRIGHTNESS], int)
     assert state.attributes[ATTR_BRIGHTNESS] == 255
 
     # Color Dimmer 1
@@ -103,6 +104,7 @@ async def test_entity_state(hass, light_devices):
     )
     assert state.attributes[ATTR_BRIGHTNESS] == 255
     assert state.attributes[ATTR_HS_COLOR] == (273.6, 55.0)
+    assert isinstance(state.attributes[ATTR_COLOR_TEMP], int)
     assert state.attributes[ATTR_COLOR_TEMP] == 222
 
 
@@ -191,7 +193,7 @@ async def test_turn_on_with_brightness(hass, light_devices):
     assert state is not None
     assert state.state == "on"
     # round-trip rounding error (expected)
-    assert state.attributes[ATTR_BRIGHTNESS] == 73.95
+    assert state.attributes[ATTR_BRIGHTNESS] == 74
 
 
 async def test_turn_on_with_minimal_brightness(hass, light_devices):
@@ -216,7 +218,7 @@ async def test_turn_on_with_minimal_brightness(hass, light_devices):
     assert state is not None
     assert state.state == "on"
     # round-trip rounding error (expected)
-    assert state.attributes[ATTR_BRIGHTNESS] == 2.55
+    assert state.attributes[ATTR_BRIGHTNESS] == 3
 
 
 async def test_turn_on_with_color(hass, light_devices):