diff --git a/anaconda_project/internal/test/test_streaming_popen.py b/anaconda_project/internal/test/test_streaming_popen.py
index 0ad26d67..57e4492f 100644
--- a/anaconda_project/internal/test/test_streaming_popen.py
+++ b/anaconda_project/internal/test/test_streaming_popen.py
@@ -25,7 +25,7 @@ def detect_linesep(lines):
 
 def add_lineseps(lines, sep=None):
     sep = sep or os.linesep
-    return list(map(lambda l: l + sep, lines))
+    return [line + sep for line in lines]
 
 
 def test_streaming():