diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b0a4fd6abe9..ee17d503b13 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-17  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-data.h (UNDEFINED_ITEM): Remove define.
+	(struct tui_data_item_window): Update.
+
 2019-07-17  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-data.h (MAX_CONTENT_COUNT, TUI_NULL_STR)
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index de52215dc16..125b4ae4c5d 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -104,7 +104,6 @@ enum tui_box
 #define DISASSEM_NAME           "asm"
 #define HILITE                  TRUE
 #define NO_HILITE               FALSE
-#define UNDEFINED_ITEM          -1
 #define MIN_WIN_HEIGHT          3
 #define MIN_CMD_WIN_HEIGHT      3
 
@@ -263,7 +262,7 @@ struct tui_data_item_window : public tui_gen_win_info
 
   const char *name = nullptr;
   /* The register number, or data display number.  */
-  int item_no = UNDEFINED_ITEM;
+  int item_no = -1;
   void *value = nullptr;
   bool highlight = false;
   char *content = nullptr;