diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 0886c0e8495..ce78d917764 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -318,7 +318,6 @@ SUBDIR_TUI_SRCS = \
 	tui/tui-io.c \
 	tui/tui-layout.c \
 	tui/tui-location.c \
-	tui/tui-out.c \
 	tui/tui-regs.c \
 	tui/tui-source.c \
 	tui/tui-stack.c \
@@ -1605,7 +1604,6 @@ HFILES_NO_SRCDIR = \
 	tui/tui-io.h \
 	tui/tui-layout.h \
 	tui/tui-location.h \
-	tui/tui-out.h \
 	tui/tui-regs.h \
 	tui/tui-source.h \
 	tui/tui-stack.h \
diff --git a/gdb/source.c b/gdb/source.c
index f648adc4520..1b58497dbd1 100644
--- a/gdb/source.c
+++ b/gdb/source.c
@@ -1345,25 +1345,16 @@ print_source_lines_base (struct symtab *s, int line, int stopline,
 	  uiout->field_signed ("line", line);
 	  uiout->text ("\tin ");
 
-	  /* CLI expects only the "file" field.  TUI expects only the
-	     "fullname" field (and TUI does break if "file" is printed).
-	     MI expects both fields.  ui_source_list is set only for CLI,
-	     not for TUI.  */
+	  /* CLI expects only the "file" field.  MI expects both
+	     fields.  ui_source_list is set only for CLI, not for
+	     TUI.  */
 	  if (uiout->is_mi_like_p () || uiout->test_flags (ui_source_list))
 	    uiout->field_string ("file", symtab_to_filename_for_display (s),
 				 file_name_style.style ());
-	  if (uiout->is_mi_like_p () || !uiout->test_flags (ui_source_list))
+	  if (uiout->is_mi_like_p ())
 	    {
 	      const char *s_fullname = symtab_to_fullname (s);
-	      char *local_fullname;
-
-	      /* ui_out_field_string may free S_FULLNAME by calling
-		 open_source_file for it again.  See e.g.,
-		 tui_field_string->tui_show_source.  */
-	      local_fullname = (char *) alloca (strlen (s_fullname) + 1);
-	      strcpy (local_fullname, s_fullname);
-
-	      uiout->field_string ("fullname", local_fullname);
+	      uiout->field_string ("fullname", s_fullname);
 	    }
 
 	  uiout->text ("\n");
diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index 84724643fd5..382239e4dd5 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -33,7 +33,6 @@
 #include "tui/tui-win.h"
 #include "tui/tui-wingeneral.h"
 #include "tui/tui-file.h"
-#include "tui/tui-out.h"
 #include "ui-out.h"
 #include "cli-out.h"
 #include <fcntl.h>
@@ -917,7 +916,7 @@ tui_initialize_io (void)
   tui_stdout = new pager_file (new tui_file (stdout, true));
   tui_stderr = new tui_file (stderr, false);
   tui_stdlog = new timestamped_file (tui_stderr);
-  tui_out = new tui_ui_out (tui_stdout);
+  tui_out = new cli_ui_out (tui_stdout, 0);
 
   /* Create the default UI.  */
   tui_old_uiout = new cli_ui_out (gdb_stdout);
diff --git a/gdb/tui/tui-out.c b/gdb/tui/tui-out.c
deleted file mode 100644
index b8e7de197cf..00000000000
--- a/gdb/tui/tui-out.c
+++ /dev/null
@@ -1,111 +0,0 @@
-/* Output generating routines for GDB CLI.
-
-   Copyright (C) 1999-2023 Free Software Foundation, Inc.
-
-   Contributed by Cygnus Solutions.
-   Written by Fernando Nasser for Cygnus.
-
-   This file is part of GDB.
-
-   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
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include "defs.h"
-#include "ui-out.h"
-#include "tui-out.h"
-#include "tui.h"
-
-/* Output an int field.  */
-
-void
-tui_ui_out::do_field_signed (int fldno, int width, ui_align alignment,
-			     const char *fldname, LONGEST value)
-{
-  if (suppress_output ())
-    return;
-
-  /* Don't print line number, keep it for later.  */
-  if (m_start_of_line == 0 && strcmp (fldname, "line") == 0)
-    {
-      m_start_of_line++;
-      m_line = value;
-      return;
-    }
-  m_start_of_line++;
-
-  cli_ui_out::do_field_signed (fldno, width, alignment, fldname, value);
-}
-
-/* Other cli_field_* end up here so alignment and field separators are
-   both handled by tui_field_string.  */
-
-void
-tui_ui_out::do_field_string (int fldno, int width, ui_align align,
-			     const char *fldname, const char *string,
-			     const ui_file_style &style)
-{
-  if (suppress_output ())
-    return;
-
-  m_start_of_line++;
-
-  if (fldname && m_line > 0 && strcmp (fldname, "fullname") == 0)
-    return;
-
-  cli_ui_out::do_field_string (fldno, width, align, fldname, string, style);
-}
-
-void
-tui_ui_out::do_field_fmt (int fldno, int width, ui_align align,
-			  const char *fldname, const ui_file_style &style,
-			  const char *format, va_list args)
-{
-  if (suppress_output ())
-    return;
-
-  m_start_of_line++;
-
-  cli_ui_out::do_field_fmt (fldno, width, align, fldname, style, format, args);
-}
-
-void
-tui_ui_out::do_text (const char *string)
-{
-  if (suppress_output ())
-    return;
-
-  m_start_of_line++;
-  if (m_line > 0)
-    {
-      /* Printing a source line, so suppress regular output -- the
-	 line was shown on the TUI's source window by tui_show_source
-	 above instead.  */
-      if (strchr (string, '\n') != 0)
-	{
-	  /* We've reached the end of the line, so go back to letting
-	     text output go to the console.  */
-	  m_line = 0;
-	  m_start_of_line = 0;
-	}
-      return;
-    }
-  if (strchr (string, '\n'))
-    m_start_of_line = 0;
-
-  cli_ui_out::do_text (string);
-}
-
-tui_ui_out::tui_ui_out (ui_file *stream)
-  : cli_ui_out (stream, 0)
-{
-}
diff --git a/gdb/tui/tui-out.h b/gdb/tui/tui-out.h
deleted file mode 100644
index ec7e02bb900..00000000000
--- a/gdb/tui/tui-out.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/* Copyright (C) 2016-2023 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   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
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#ifndef TUI_TUI_OUT_H
-#define TUI_TUI_OUT_H
-
-#include "cli-out.h"
-
-/* A ui_out class for the TUI.  This is just like the CLI's ui_out,
-   except that it overrides output methods to detect when a source
-   line is being printed and show the source in the TUI's source
-   window instead of printing the line in the console window.  */
-class tui_ui_out : public cli_ui_out
-{
-public:
-
-  explicit tui_ui_out (ui_file *stream);
-
-protected:
-
-  void do_field_signed (int fldno, int width, ui_align align, const char *fldname,
-			LONGEST value) override;
-  void do_field_string (int fldno, int width, ui_align align, const char *fldname,
-			const char *string, const ui_file_style &style) override;
-  void do_field_fmt (int fldno, int width, ui_align align, const char *fldname,
-		     const ui_file_style &style,
-		     const char *format, va_list args) override
-    ATTRIBUTE_PRINTF (7, 0);
-  void do_text (const char *string) override;
-
-private:
-
-  /* These fields are used to make print_source_lines show the source
-     in the TUI's source window instead of in the console.
-     M_START_OF_LINE is incremented whenever something is output to
-     the ui_out.  If an integer field named "line" is printed on the
-     ui_out, and nothing else has been printed yet (both
-     M_START_OF_LINE and M_LINE are still 0), we assume
-     print_source_lines is starting to print a source line, and thus
-     record the line number in M_LINE.  Afterwards, when we see a
-     string field named "fullname" being output, we take the fullname
-     and the recorded line and show the source line in the TUI's
-     source window.  tui_ui_out::do_text() suppresses text output
-     until it sees an endline being printed, at which point these
-     variables are reset back to 0.  */
-  int m_line = 0;
-  int m_start_of_line = 0;
-};
-
-#endif /* TUI_TUI_OUT_H */
