diff --git a/tcp_tests/helpers/env_config.py b/tcp_tests/helpers/env_config.py
index 5dbc87d..b811030 100644
--- a/tcp_tests/helpers/env_config.py
+++ b/tcp_tests/helpers/env_config.py
@@ -150,7 +150,7 @@
     :param path: string
     :returns: key string, indexes list
     """
-    pattern = re.compile("\[([0-9]*)\]")
+    pattern = re.compile(r"\[([0-9]*)\]")
     # find all indexes of possible list object in path
     indexes = (lambda x: [int(r) for r in pattern.findall(x)]
                if pattern.search(x) else [])