diff --git a/src/layoutparser/io/pdf.py b/src/layoutparser/io/pdf.py
index ad35cf4..957bcb1 100644
--- a/src/layoutparser/io/pdf.py
+++ b/src/layoutparser/io/pdf.py
@@ -16,6 +16,7 @@
 
 import pdfplumber
 import pandas as pd
+from PIL import Image
 
 from ..elements import Layout
 from .basic import load_dataframe