diff --git a/pypdfocr/pypdfocr_pdf.py b/pypdfocr/pypdfocr_pdf.py
index bdc1f86..b63a8bc 100644
--- a/pypdfocr/pypdfocr_pdf.py
+++ b/pypdfocr/pypdfocr_pdf.py
@@ -152,7 +152,8 @@ def overlay_hocr_pages(self, dpi, hocr_filenames, orig_pdf_filename):
         all_text_filename = os.path.join(pdf_dir, "%s_text.pdf" % (basename))
         merger = PdfFileMerger()
         for text_pdf_filename in text_pdf_filenames:
-            merger.append(PdfFileReader(file(text_pdf_filename, 'rb')))
+            with open(text_pdf_filename, 'rb') as file:
+                    merger.append(PdfFileReader(file))
         merger.write(all_text_filename)
         merger.close()
 	del merger