diff --git a/src/services/models/Schema.ts b/src/services/models/Schema.ts
index 0ce7e6fdce..678c8d4264 100644
--- a/src/services/models/Schema.ts
+++ b/src/services/models/Schema.ts
@@ -283,7 +283,7 @@ export class SchemaModel {
 
         if (indexLeft < 0 && indexRight < 0) {
           // out of mapping, order by name
-          return left.name - right.name;
+          return left.name.localCompare(right.name);
         } else if (indexLeft < 0) {
           // the right is found, so mapping wins
           return 1;