diff --git a/cmd-set-window-option.c b/cmd-set-window-option.c
index 5f24af72..46e94732 100644
--- a/cmd-set-window-option.c
+++ b/cmd-set-window-option.c
@@ -56,6 +56,7 @@ const struct set_option_entry set_window_option_table[NSETWINDOWOPTION] = {
 	  SET_OPTION_CHOICE, 0, 0, set_option_clock_mode_style_list },
 	{ "force-height", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
 	{ "force-width", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
+	{ "main-pane-height", SET_OPTION_NUMBER, 1, INT_MAX, NULL },
 	{ "main-pane-width", SET_OPTION_NUMBER, 1, INT_MAX, NULL },
 	{ "mode-attr", SET_OPTION_ATTRIBUTES, 0, 0, NULL },
 	{ "mode-bg", SET_OPTION_COLOUR, 0, 0, NULL },
diff --git a/tmux.h b/tmux.h
index 2b26b699..680a4ee1 100644
--- a/tmux.h
+++ b/tmux.h
@@ -942,7 +942,7 @@ struct set_option_entry {
 extern const struct set_option_entry set_option_table[];
 extern const struct set_option_entry set_window_option_table[];
 #define NSETOPTION 26
-#define NSETWINDOWOPTION 19
+#define NSETWINDOWOPTION 20
 
 /* tmux.c */
 extern volatile sig_atomic_t sigwinch;