diff --git a/builtins/common.h b/builtins/common.h

--- a/builtins/common.h

+++ b/builtins/common.h

@@ -257,6 +257,10 @@ extern int print_shift_error;

 extern int expand_once_flag;

 #endif

+#if defined (EXTENDED_GLOB)

+extern int extglob_flag;

+#endif

+

 extern int expaliases_flag;

 /* variables from source.def */

diff --git a/builtins/shopt.def b/builtins/shopt.def

--- a/builtins/shopt.def

+++ b/builtins/shopt.def

@@ -149,6 +149,11 @@ static int shopt_set_complete_direxpand PARAMS((char *, int));

 static int set_assoc_expand PARAMS((char *, int));

 #endif

+#if defined (EXTENDED_GLOB)

+int extglob_flag = EXTGLOB_DEFAULT;

+static int shopt_set_extglob PARAMS((char *, int));

+#endif

+

 int expaliases_flag = 0;

 static int shopt_set_expaliases PARAMS((char *, int));

@@ -206,7 +211,7 @@ static struct {

   { "extdebug", &debugging_mode, shopt_set_debug_mode },

 #endif

 #if defined (EXTENDED_GLOB)

-  { "extglob", &extended_glob, (shopt_set_func_t *)NULL },

+  { "extglob", &extglob_flag, shopt_set_extglob },

 #endif

   { "extquote", &extended_quote, (shopt_set_func_t *)NULL },

   { "failglob", &fail_glob_expansion, (shopt_set_func_t *)NULL },

@@ -377,7 +382,7 @@ reset_shopt_options ()

 #endif

 #if defined (EXTENDED_GLOB)

-  extended_glob = EXTGLOB_DEFAULT;

+  extended_glob = extglob_flag = EXTGLOB_DEFAULT;

 #endif

 #if defined (ARRAY_VARS)

@@ -643,6 +648,17 @@ shopt_set_expaliases (option_name, mode)

   return 0;

 }

+#if defined (EXTENDED_GLOB)

+static int

+shopt_set_extglob (option_name, mode)

+     char *option_name;

+     int mode;

+{

+  extended_glob = extglob_flag;

+  return 0;

+}

+#endif

+

 #if defined (READLINE)

 static int

 shopt_enable_hostname_completion (option_name, mode)

diff --git a/execute_cmd.c b/execute_cmd.c

--- a/execute_cmd.c

+++ b/execute_cmd.c

@@ -3990,13 +3990,11 @@ execute_cond_node (cond)

       else

 #endif /* COND_REGEXP */

 	{

-	  int oe;

-	  oe = extended_glob;

 	  extended_glob = 1;

 	  result = binary_test (cond->op->word, arg1, arg2, TEST_PATMATCH|TEST_ARITHEXP|TEST_LOCALE)

 				  ? EXECUTION_SUCCESS

 				  : EXECUTION_FAILURE;

-	  extended_glob = oe;

+	  extended_glob = extglob_flag;

 	}

       if (arg1 != nullstr)

 	free (arg1);

diff --git a/parse.y b/parse.y

--- a/parse.y

+++ b/parse.y

@@ -125,7 +125,7 @@ do { \

 } while (0)

 #if defined (EXTENDED_GLOB)

-extern int extended_glob;

+extern int extended_glob, extglob_flag;

 #endif

 #if defined (TRANSLATABLE_STRINGS)

@@ -3304,7 +3304,7 @@ reset_parser ()

 #if defined (EXTENDED_GLOB)

   /* Reset to global value of extended glob */

   if (parser_state & (PST_EXTPAT|PST_CMDSUBST))

-    extended_glob = global_extglob;

+    extended_glob = extglob_flag;

 #endif

   if (parser_state & (PST_CMDSUBST|PST_STRING))

     expand_aliases = expaliases_flag;

@@ -4124,10 +4124,10 @@ parse_comsub (qc, open, close, lenp, flags)

     expand_aliases = posixly_correct != 0;

 #if defined (EXTENDED_GLOB)

   /* If (parser_state & PST_EXTPAT), we're parsing an extended pattern for a

-     conditional command and have already set global_extglob appropriately. */

+     conditional command and have already set extended_glob appropriately. */

   if (shell_compatibility_level <= 51 && was_extpat == 0)

     {

-      local_extglob = global_extglob = extended_glob;

+      local_extglob = extended_glob;

       extended_glob = 1;

     }

 #endif

@@ -4235,7 +4235,7 @@ xparse_dolparen (base, string, indp, flags)

 {

   sh_parser_state_t ps;

   sh_input_line_state_t ls;

-  int orig_ind, nc, sflags, start_lineno;

+  int orig_ind, nc, sflags, start_lineno, local_extglob;

   char *ret, *ep, *ostring;

 /*debug_parser(1);*/

@@ -4278,7 +4278,7 @@ xparse_dolparen (base, string, indp, flags)

      old value will be restored by restore_parser_state(). */

   expand_aliases = 0;

 #if defined (EXTENDED_GLOB)

-  global_extglob = extended_glob;		/* for reset_parser() */

+  local_extglob = extended_glob;

 #endif

   token_to_read = DOLPAREN;			/* let's trick the parser */

@@ -4296,6 +4296,9 @@ xparse_dolparen (base, string, indp, flags)

   restore_input_line_state (&ls);

   restore_parser_state (&ps);

+#if defined (EXTENDED_GLOB)

+  extended_glob = local_extglob;

+#endif

   token_to_read = 0;

   /* If parse_string returns < 0, we need to jump to top level with the

@@ -4731,12 +4734,16 @@ cond_term ()

 	}

       /* rhs */

+#if defined (EXTENDED_GLOB)

       local_extglob = extended_glob;

       if (parser_state & PST_EXTPAT)

 	extended_glob = 1;

+#endif

       tok = read_token (READ);

+#if defined (EXTENDED_GLOB)

       if (parser_state & PST_EXTPAT)

 	extended_glob = local_extglob;

+#endif

       parser_state &= ~(PST_REGEXP|PST_EXTPAT);

       if (tok == WORD)

@@ -4783,7 +4790,6 @@ parse_cond_command ()

 {

   COND_COM *cexp;

-  global_extglob = extended_glob;

   cexp = cond_expr ();

   return (make_cond_command (cexp));

 }

diff --git a/patchlevel.h b/patchlevel.h

--- a/patchlevel.h

+++ b/patchlevel.h

@@ -25,6 +25,6 @@

    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh

    looks for to find the patch level (for the sccs version string). */

-#define PATCHLEVEL 11

+#define PATCHLEVEL 12

 #endif /* _PATCHLEVEL_H_ */

diff --git a/y.tab.c b/y.tab.c

--- a/y.tab.c

+++ b/y.tab.c

@@ -175,7 +175,7 @@ do { \

 } while (0)

 #if defined (EXTENDED_GLOB)

-extern int extended_glob;

+extern int extended_glob, extglob_flag;

 #endif

 #if defined (TRANSLATABLE_STRINGS)

@@ -5615,7 +5615,7 @@ reset_parser ()

 #if defined (EXTENDED_GLOB)

   /* Reset to global value of extended glob */

   if (parser_state & (PST_EXTPAT|PST_CMDSUBST))

-    extended_glob = global_extglob;

+    extended_glob = extglob_flag;

 #endif

   if (parser_state & (PST_CMDSUBST|PST_STRING))

     expand_aliases = expaliases_flag;

@@ -6435,10 +6435,10 @@ parse_comsub (qc, open, close, lenp, flags)

     expand_aliases = posixly_correct != 0;

 #if defined (EXTENDED_GLOB)

   /* If (parser_state & PST_EXTPAT), we're parsing an extended pattern for a

-     conditional command and have already set global_extglob appropriately. */

+     conditional command and have already set extended_glob appropriately. */

   if (shell_compatibility_level <= 51 && was_extpat == 0)

     {

-      local_extglob = global_extglob = extended_glob;

+      local_extglob = extended_glob;

       extended_glob = 1;

     }

 #endif

@@ -6546,7 +6546,7 @@ xparse_dolparen (base, string, indp, flags)

 {

   sh_parser_state_t ps;

   sh_input_line_state_t ls;

-  int orig_ind, nc, sflags, start_lineno;

+  int orig_ind, nc, sflags, start_lineno, local_extglob;

   char *ret, *ep, *ostring;

 /*debug_parser(1);*/

@@ -6589,7 +6589,7 @@ xparse_dolparen (base, string, indp, flags)

      old value will be restored by restore_parser_state(). */

   expand_aliases = 0;

 #if defined (EXTENDED_GLOB)

-  global_extglob = extended_glob;		/* for reset_parser() */

+  local_extglob = extended_glob;

 #endif

   token_to_read = DOLPAREN;			/* let's trick the parser */

@@ -6607,6 +6607,9 @@ xparse_dolparen (base, string, indp, flags)

   restore_input_line_state (&ls);

   restore_parser_state (&ps);

+#if defined (EXTENDED_GLOB)

+  extended_glob = local_extglob;

+#endif

   token_to_read = 0;

   /* If parse_string returns < 0, we need to jump to top level with the

@@ -7042,12 +7045,16 @@ cond_term ()

 	}

       /* rhs */

+#if defined (EXTENDED_GLOB)

       local_extglob = extended_glob;

       if (parser_state & PST_EXTPAT)

 	extended_glob = 1;

+#endif

       tok = read_token (READ);

+#if defined (EXTENDED_GLOB)

       if (parser_state & PST_EXTPAT)

 	extended_glob = local_extglob;

+#endif

       parser_state &= ~(PST_REGEXP|PST_EXTPAT);

       if (tok == WORD)

@@ -7094,7 +7101,6 @@ parse_cond_command ()

 {

   COND_COM *cexp;

-  global_extglob = extended_glob;

   cexp = cond_expr ();

   return (make_cond_command (cexp));

 }