diff --git a/parsers/CTD/src/loadCTD.py b/parsers/CTD/src/loadCTD.py
index 608f561d..9bd9e75c 100644
--- a/parsers/CTD/src/loadCTD.py
+++ b/parsers/CTD/src/loadCTD.py
@@ -533,7 +533,7 @@ def convert_predicates(predicate):
         :return:
         """
         # the capture regex
-        regex = '\/|\ |\^'
+        regex = r'\/|\ |\^'
 
         # clean up the predicate
         cleaned_predicate = re.sub(regex, '_', predicate)