diff --git a/llm/server.go b/llm/server.go
index 6cb01fa0..0a815798 100644
--- a/llm/server.go
+++ b/llm/server.go
@@ -606,7 +606,7 @@ array  ::=
 
 string ::=
   "\"" (
-    [^"\\] |
+    [^"\\\x7F\x00-\x1F] |
     "\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
   )* "\"" ws