diff --git a/src/winio.c b/src/winio.c
index 440b6c556190543b0b8e6221e62a72de307e16c4..2e23045dc9190fd09e15864cd353f1ce5e9dd13e 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -184,6 +184,10 @@ void get_buffer(WINDOW *win)
 
     /* Switch back to non-blocking input. */
     nodelay(win, FALSE);
+
+#ifdef DEBUG
+    fprintf(stderr, "get_buffer(): key_buffer_len = %lu\n", (unsigned long)key_buffer_len);
+#endif
 }
 
 /* Return the length of the default keystroke buffer. */