diff --git a/annotation/map.go b/annotation/map.go
index 5f1f08d1..0298796b 100644
--- a/annotation/map.go
+++ b/annotation/map.go
@@ -365,14 +365,6 @@ func TypeIsDefaultNilable(t types.Type) bool {
 		return true
 	}
 
-	// Additionally, we allow custom default nilable types provided by the users.
-	if t, ok := t.(*types.Named); ok {
-		for _, defaultNilableNamedType := range config.DefaultNilableNamedTypes {
-			if t.String() == defaultNilableNamedType {
-				return true
-			}
-		}
-	}
 	return false
 }
 
diff --git a/config/const.go b/config/const.go
index 841beaba..bd7fd5d8 100644
--- a/config/const.go
+++ b/config/const.go
@@ -38,6 +38,3 @@ const NilAwayPkgPathPrefix = uberPkgPathPrefix + "/nilaway"
 // to the locations that triggered errors - right now it seems as if 1 is sufficient disambiguation,
 // but feel free to increase.
 const DirLevelsToPrintForTriggers = 1
-
-// DefaultNilableNamedTypes is the list of type names that we interpret as default nilable.
-var DefaultNilableNamedTypes = [...]string{}