diff --git a/pilot/source_embedding/pdf_embedding.py b/pilot/source_embedding/pdf_embedding.py
index 6eced03f3..54f77fb81 100644
--- a/pilot/source_embedding/pdf_embedding.py
+++ b/pilot/source_embedding/pdf_embedding.py
@@ -15,12 +15,11 @@ CFG = Config()
 class PDFEmbedding(SourceEmbedding):
     """pdf embedding for read pdf document."""
 
-    def __init__(self, file_path, vector_store_config, encoding):
+    def __init__(self, file_path, vector_store_config):
         """Initialize with pdf path."""
         super().__init__(file_path, vector_store_config)
         self.file_path = file_path
         self.vector_store_config = vector_store_config
-        self.encoding = encoding
 
     @register
     def read(self):