diff --git a/src/sagemaker/feature_store/feature_group.py b/src/sagemaker/feature_store/feature_group.py
index 689b70c0d7..7cce7a2dca 100644
--- a/src/sagemaker/feature_store/feature_group.py
+++ b/src/sagemaker/feature_store/feature_group.py
@@ -741,7 +741,7 @@ def load_feature_definitions(
         feature_definitions = []
         for column in data_frame:
             feature_type = self.DTYPE_TO_FEATURE_DEFINITION_CLS_MAP.get(
-                str(data_frame[column].dtype), None
+                str(data_frame[column].dtype).lower(), None
             )
             if feature_type:
                 feature_definitions.append(