diff --git a/test/crit-recode.py b/test/crit-recode.py
index e929916c9..4923b16e0 100755
--- a/test/crit-recode.py
+++ b/test/crit-recode.py
@@ -61,7 +61,8 @@ for imgf in find.stdout.readlines():
     if imgf_b.startswith(b'rule-'):
         continue
 
-    o_img = open(imgf.decode(), "rb").read()
+    with open(imgf.decode(), "rb") as fh:
+        o_img = fh.read()
     if not recode_and_check(imgf, o_img, False):
         test_pass = False
     if not recode_and_check(imgf, o_img, True):