diff --git a/llmfoundry/utils/config_utils.py b/llmfoundry/utils/config_utils.py
index 5ab148bbe8..5c1ec9114a 100644
--- a/llmfoundry/utils/config_utils.py
+++ b/llmfoundry/utils/config_utils.py
@@ -100,7 +100,7 @@ class TrainConfig:
     optimizer: Dict[str, Any] = MISSING
     scheduler: Dict[str, Any] = MISSING
     train_loader: Dict[str, Any] = MISSING
-    device_train_batch_size: int = MISSING
+    device_train_batch_size: Union[int, float] = MISSING
     device_eval_batch_size: int = MISSING
     max_duration: Union[int, str] = MISSING
     eval_interval: Union[int, str] = MISSING
@@ -183,7 +183,6 @@ class TrainConfig:
 
     # Fields created by `update_batch_size_info`
     n_gpus: int = MISSING
-    device_train_batch_size: int = MISSING
     device_train_grad_accum: str = MISSING