diff --git a/backend/src/api/nft_manager.py b/backend/src/api/nft_manager.py
index fdc3405..9554eb1 100644
--- a/backend/src/api/nft_manager.py
+++ b/backend/src/api/nft_manager.py
@@ -708,7 +708,7 @@ def list_rules():
     try:
         try:
             nft_json = mgr.list_rules_json()
-            nft_text = mgr.list_rules_text().replace("\r", "").replace("\t", "").replace("\n", "")
+            nft_text = mgr.list_rules_text().replace("\r", "").replace("\t", "").replace("\n", " ")
             logger.error("Successfully obtained nft JSON ruleset, but also got textual output: %r", nft_text)
         except NftError as e:
             logger.debug("could not obtain nft JSON ruleset: %s", e)