diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index 7923c137b77..3741184d8cb 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -1,5 +1,5 @@
-/* Copyright (c) 2000, 2019, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2022, MariaDB Corporation.
+/* Copyright (c) 2000, 2025, Oracle and/or its affiliates.
+   Copyright (c) 2009, 2025, MariaDB Corporation.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -2564,6 +2564,8 @@ int Lex_input_stream::lex_one_token(YYSTYPE *yylval, THD *thd)
       state=MY_LEX_CHAR;
       break;
     case MY_LEX_END:
+      /* Unclosed special comments result in a syntax error */
+      if (in_comment == DISCARD_COMMENT) return (ABORT_SYM);
       next_state= MY_LEX_END;
       return(0);                        // We found end of input last time