diff --git a/docling/datamodel/document.py b/docling/datamodel/document.py
index a2a93aa3..e37541b7 100644
--- a/docling/datamodel/document.py
+++ b/docling/datamodel/document.py
@@ -352,6 +352,8 @@ def _mime_from_extension(ext):
             mime = FormatToMimeType[InputFormat.MD][0]
         elif ext in FormatToExtensions[InputFormat.JSON_DOCLING]:
             mime = FormatToMimeType[InputFormat.JSON_DOCLING][0]
+        elif ext in FormatToExtensions[InputFormat.PDF]:
+            mime = FormatToMimeType[InputFormat.PDF][0]
         return mime
 
     @staticmethod