diff --git a/tests/basic/test_coder.py b/tests/basic/test_coder.py
index 538ae8e3f..6eb0148b0 100644
--- a/tests/basic/test_coder.py
+++ b/tests/basic/test_coder.py
@@ -325,7 +325,9 @@ class TestCoder(unittest.TestCase):
                 #    {test_files[1]},
                 # ),
                 # Files with Windows-style paths
-                (f"Edit the file {test_files[2].replace('/', r'\\')}", {test_files[2]}),
+                # Pre-format the Windows path to avoid backslash issues in f-string expressions
+                windows_path = test_files[2].replace('/', '\\')
+                (f"Edit the file {windows_path}", {test_files[2]}),
                 # Files with different quote styles
                 (f'Check "{test_files[5]}" now', {test_files[5]}),
                 # All files in one complex message