diff --git a/addons/misra.py b/addons/misra.py
index 7c7774c52e3..dddb2e2602f 100755
--- a/addons/misra.py
+++ b/addons/misra.py
@@ -4912,9 +4912,13 @@ def is_different_location(loc1, loc2):
         def is_different_file(loc1, loc2):
             return loc1['file'] != loc2['file']
 
+        def read_lines(filename):
+            with open(filename, 'rt') as f:
+                yield from f
+
         try:
             for filename in ctu_info_files:
-                for line in open(filename, 'rt'):
+                for line in read_lines(filename):
                     s = self.read_ctu_info_line(line)
                     if s is None:
                         continue