diff --git a/deepdoc/parser/pdf_parser.py b/deepdoc/parser/pdf_parser.py
index 0ed9073d3..c9f2f34ca 100644
--- a/deepdoc/parser/pdf_parser.py
+++ b/deepdoc/parser/pdf_parser.py
@@ -1130,7 +1130,7 @@ class RAGFlowPdfParser:
             bxes = [b for bxs in self.boxes for b in bxs]
             self.is_english = re.search(r"[\na-zA-Z0-9,/¸;:'\[\]\(\)!@#$%^&*\"?<>._-]{30,}", "".join([b["text"] for b in random.choices(bxes, k=min(30, len(bxes)))]))
 
-        logging.debug("Is it English:", self.is_english)
+        logging.debug(f"Is it English: {self.is_english}")
 
         self.page_cum_height = np.cumsum(self.page_cum_height)
         assert len(self.page_cum_height) == len(self.page_images) + 1