diff --git a/thunder/executors/nvfuserex_impl.py b/thunder/executors/nvfuserex_impl.py
index f51e303380..4b6b59d588 100644
--- a/thunder/executors/nvfuserex_impl.py
+++ b/thunder/executors/nvfuserex_impl.py
@@ -122,6 +122,14 @@
         }
     )
 
+if nvfuser_version() >= LooseVersion("0.2.28"):
+    _lcdtype_to_nvdtype_map.update(
+        {
+            dtypes.float4_e2m1fn_x2: DataType.Float4_e2m1fn_x2,
+            dtypes.float4_e2m1fn_x2_: DataType.Float4_e2m1fn_x2,
+        }
+    )
+
 _lcfp8_to_nvfp8_map: dict[dtypes.dtype, DataType] = {
     dtypes.float8_e5m2: DataType.Float8_e5m2,
     dtypes.float8_e5m2_: DataType.Float8_e5m2,