diff --git a/tests/lint/line_length.py b/tests/lint/line_length.py
index ea973f52..74d4bde1 100755
--- a/tests/lint/line_length.py
+++ b/tests/lint/line_length.py
@@ -53,7 +53,7 @@ def main():
     exit_status = 0
 
     for arg in sys.argv[1:]:
-        with open(arg, "r") as source_file:
+        with open(arg) as source_file:
             for i, line in enumerate(source_file, start=1):
                 line = line.rstrip()
                 # Lines that end with a string are exempted