diff --git a/src/filters/rcltext.py b/src/filters/rcltext.py
index 2595276c..9cd24c65 100755
--- a/src/filters/rcltext.py
+++ b/src/filters/rcltext.py
@@ -31,8 +31,8 @@ class TxtDump(RclBaseHandler):
     def html_text(self, fn):
         # No charset, so recoll will have to use its config to guess it
         html = b'<html><head><title></title></head><body><pre>'
-        f = open(fn, "rb")
-        html += self.em.htmlescape(f.read())
+        with open(fn, "rb") as f:
+            html += self.em.htmlescape(f.read())
         html += b'</pre></body></html>'
         return html
 
