diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 3b2fdd20565..ba434dd3003 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-09-20  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui.h (strcat_to_buf): Don't declare.
+	* tui/tui.c (strcat_to_buf): Remove.
+
 2019-09-20  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-source.h (struct tui_source_window) <m_fullname>: Rename
diff --git a/gdb/tui/tui.c b/gdb/tui/tui.c
index 966304f3408..30bf5488794 100644
--- a/gdb/tui/tui.c
+++ b/gdb/tui/tui.c
@@ -570,19 +570,6 @@ tui_disable_command (const char *args, int from_tty)
   tui_disable ();
 }
 
-void
-strcat_to_buf (char *buf, int buflen, 
-	       const char *item_to_add)
-{
-  if (item_to_add != NULL && buf != NULL)
-    {
-      if ((strlen (buf) + strlen (item_to_add)) <= buflen)
-	strcat (buf, item_to_add);
-      else
-	strncat (buf, item_to_add, (buflen - strlen (buf)));
-    }
-}
-
 #if 0
 /* Solaris <sys/termios.h> defines CTRL.  */
 #ifndef CTRL
diff --git a/gdb/tui/tui.h b/gdb/tui/tui.h
index 25ae0c5e471..baf4a813b60 100644
--- a/gdb/tui/tui.h
+++ b/gdb/tui/tui.h
@@ -24,8 +24,6 @@
 
 struct ui_file;
 
-extern void strcat_to_buf (char *, int, const char *);
-
 /* Types of error returns.  */
 enum tui_status
 {