diff --git a/docling/backend/msexcel_backend.py b/docling/backend/msexcel_backend.py
index cc2e4106..bd30da69 100644
--- a/docling/backend/msexcel_backend.py
+++ b/docling/backend/msexcel_backend.py
@@ -67,7 +67,7 @@ class MsExcelDocumentBackend(DeclarativeDocumentBackend):
 
     @classmethod
     def supported_formats(cls) -> Set[InputFormat]:
-        return {InputFormat.EXCEL}
+        return {InputFormat.XLSX}
 
     def convert(self) -> DoclingDocument:
         # Parses the DOCX into a structured document model.
@@ -76,7 +76,7 @@ class MsExcelDocumentBackend(DeclarativeDocumentBackend):
 
         origin = DocumentOrigin(
             filename=self.file.name or "file",
-            mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",            
+            mimetype="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
             binary_hash=self.document_hash,
         )
 
diff --git a/docling/document_converter.py b/docling/document_converter.py
index 01c9a58d..4e436d07 100644
--- a/docling/document_converter.py
+++ b/docling/document_converter.py
@@ -86,7 +86,7 @@ class ImageFormatOption(FormatOption):
 
 
 _format_to_default_options = {
-    InputFormat.EXCEL: FormatOption(
+    InputFormat.XLSX: FormatOption(
         pipeline_cls=SimplePipeline, backend=MsExcelDocumentBackend
     ),
     InputFormat.DOCX: FormatOption(