diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 96bf00595d..3b2fdd2056 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2019-09-20  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-source.h (struct tui_source_window) <m_fullname>: Rename
+	from "fullname".
+	* tui/tui-source.c (tui_source_window::set_contents)
+	(tui_source_window::location_matches_p)
+	(tui_source_window::maybe_update): Update.
+
 2019-09-20  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-regs.h (struct tui_data_window) <get_current_group>:
diff --git a/gdb/tui/tui-source.c b/gdb/tui/tui-source.c
index e6cc0dbc1a..fa6ed7893f 100644
--- a/gdb/tui/tui-source.c
+++ b/gdb/tui/tui-source.c
@@ -155,7 +155,7 @@ tui_source_window::set_contents (struct gdbarch *arch,
 
 	  title = s_filename;
 
-	  fullname = make_unique_xstrdup (symtab_to_fullname (s));
+	  m_fullname = make_unique_xstrdup (symtab_to_fullname (s));
 
 	  cur_line = 0;
 	  gdbarch = get_objfile_arch (SYMTAB_OBJFILE (s));
@@ -275,7 +275,7 @@ tui_source_window::location_matches_p (struct bp_location *loc, int line_no)
   return (content[line_no].line_or_addr.loa == LOA_LINE
 	  && content[line_no].line_or_addr.u.line_no == loc->line_number
 	  && loc->symtab != NULL
-	  && filename_cmp (fullname.get (),
+	  && filename_cmp (m_fullname.get (),
 			   symtab_to_fullname (loc->symtab)) == 0);
 }
 
@@ -307,7 +307,7 @@ tui_source_window::maybe_update (struct frame_info *fi, symtab_and_line sal,
     start_line = 1;
 
   bool source_already_displayed = (sal.symtab != 0
-				   && showing_source_p (fullname.get ()));
+				   && showing_source_p (m_fullname.get ()));
 
   struct tui_line_or_address l;
 
diff --git a/gdb/tui/tui-source.h b/gdb/tui/tui-source.h
index 30728e4214..3ef737c56e 100644
--- a/gdb/tui/tui-source.h
+++ b/gdb/tui/tui-source.h
@@ -77,7 +77,7 @@ private:
   bool line_is_displayed (int line) const;
 
   /* It is the resolved form as returned by symtab_to_fullname.  */
-  gdb::unique_xmalloc_ptr<char> fullname;
+  gdb::unique_xmalloc_ptr<char> m_fullname;
 
   /* A token used to register and unregister an observer.  */
   gdb::observers::token m_observable;