diff --git a/singer_sdk/_singerlib/schema.py b/singer_sdk/_singerlib/schema.py
index 9ef615e0d..84b584f05 100644
--- a/singer_sdk/_singerlib/schema.py
+++ b/singer_sdk/_singerlib/schema.py
@@ -21,6 +21,7 @@
     "minLength",
     "format",
     "type",
+    "default",
     "required",
     "enum",
     "pattern",