diff --git a/unarchived_data_fix.py b/unarchived_data_fix.py
index aafead9..b58e5ec 100755
--- a/unarchived_data_fix.py
+++ b/unarchived_data_fix.py
@@ -53,7 +53,7 @@ def check_pgroup(string):
     return string
 
 def is_pgroup(string):
-    pattern = "^p\d{5}$"
+    pattern = r"^p\d{5}$"
     return re.match(pattern, string)