diff --git a/toolkit/components/places/Database.cpp b/toolkit/components/places/Database.cpp
index 2d268cf708d8..5b9136afd9ab 100644
--- a/toolkit/components/places/Database.cpp
+++ b/toolkit/components/places/Database.cpp
@@ -67,18 +67,6 @@
 #define ENV_ALLOW_CORRUPTION \
   "ALLOW_PLACES_DATABASE_TO_LOSE_DATA_AND_BECOME_CORRUPT"
 
-// The maximum url length we can store in history.
-// We do not add to history URLs longer than this value.
-#define PREF_HISTORY_MAXURLLEN "places.history.maxUrlLength"
-// This number is mostly a guess based on various facts:
-// * IE didn't support urls longer than 2083 chars
-// * Sitemaps protocol used to support a maximum of 2048 chars
-// * Various SEO guides suggest to not go over 2000 chars
-// * Various apps/services are known to have issues over 2000 chars
-// * RFC 2616 - HTTP/1.1 suggests being cautious about depending
-//   on URI lengths above 255 bytes
-#define PREF_HISTORY_MAXURLLEN_DEFAULT 2000
-
 #define PREF_MIGRATE_V52_ORIGIN_FRECENCIES \
   "places.database.migrateV52OriginFrecencies"