diff --git a/lib/util/ttysize.c b/lib/util/ttysize.c
index 816d251df..612698c7e 100644
--- a/lib/util/ttysize.c
+++ b/lib/util/ttysize.c
@@ -30,14 +30,6 @@
 #include "sudo_debug.h"
 #include "sudo_util.h"
 
-/* Compatibility with older tty systems. */
-#if !defined(TIOCGWINSZ) && defined(TIOCGSIZE)
-# define TIOCGWINSZ	TIOCGSIZE
-# define winsize	ttysize
-# define ws_col		ts_cols
-# define ws_row		ts_lines
-#endif
-
 #ifdef TIOCGWINSZ
 static int
 get_ttysize_ioctl(int *rowp, int *colp)
diff --git a/src/exec_pty.c b/src/exec_pty.c
index da7a7cf2a..885b65477 100644
--- a/src/exec_pty.c
+++ b/src/exec_pty.c
@@ -57,13 +57,6 @@
 #define TERM_COOKED	0
 #define TERM_RAW	1
 
-/* Compatibility with older tty systems. */
-#if !defined(TIOCGWINSZ) && defined(TIOCGSIZE)
-# define TIOCGWINSZ	TIOCGSIZE
-# define TIOCSWINSZ	TIOCSSIZE
-# define winsize	ttysize
-#endif
-
 /*
  * I/O buffer with associated read/write events and a logging action.
  * Used to, e.g. pass data from the pty to the user's terminal