diff --git a/src/lightning_lite/utilities/__init__.py b/src/lightning_lite/utilities/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/pytorch_lightning/core/mixins/device_dtype_mixin.py b/src/lightning_lite/utilities/device_dtype_mixin.py
similarity index 100%
rename from src/pytorch_lightning/core/mixins/device_dtype_mixin.py
rename to src/lightning_lite/utilities/device_dtype_mixin.py
diff --git a/src/pytorch_lightning/core/mixins/__init__.py b/src/pytorch_lightning/core/mixins/__init__.py
index a48dd82429..3671ced07a 100644
--- a/src/pytorch_lightning/core/mixins/__init__.py
+++ b/src/pytorch_lightning/core/mixins/__init__.py
@@ -12,5 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from pytorch_lightning.core.mixins.device_dtype_mixin import DeviceDtypeModuleMixin  # noqa: F401
+from lightning_lite.utilities.device_dtype_mixin import DeviceDtypeModuleMixin  # noqa: F401
 from pytorch_lightning.core.mixins.hparams_mixin import HyperparametersMixin  # noqa: F401