diff --git a/cmd-confirm-before.c b/cmd-confirm-before.c
index ce8c95e0..485e6e65 100644
--- a/cmd-confirm-before.c
+++ b/cmd-confirm-before.c
@@ -41,8 +41,9 @@ const struct cmd_entry cmd_confirm_before_entry = {
 	.name = "confirm-before",
 	.alias = "confirm",
 
-	.args = { "bp:t:", 1, 1, cmd_confirm_before_args_parse },
-	.usage = "[-b] [-p prompt] " CMD_TARGET_CLIENT_USAGE " command",
+	.args = { "bc:p:t:y", 1, 1, cmd_confirm_before_args_parse },
+	.usage = "[-by] [-c confirm_key] [-p prompt] " CMD_TARGET_CLIENT_USAGE
+		 " command",
 
 	.flags = CMD_CLIENT_TFLAG,
 	.exec = cmd_confirm_before_exec
@@ -51,6 +52,8 @@ const struct cmd_entry cmd_confirm_before_entry = {
 struct cmd_confirm_before_data {
 	struct cmdq_item	*item;
 	struct cmd_list		*cmdlist;
+	u_char			 confirm_key;
+	int			 default_yes;
 };
 
 static enum args_parse_type
@@ -68,7 +71,7 @@ cmd_confirm_before_exec(struct cmd *self, struct cmdq_item *item)
 	struct client			*tc = cmdq_get_target_client(item);
 	struct cmd_find_state		*target = cmdq_get_target(item);
 	char				*new_prompt;
-	const char			*prompt, *cmd;
+	const char			*confirm_key, *prompt, *cmd;
 	int				 wait = !args_has(args, 'b');
 
 	cdata = xcalloc(1, sizeof *cdata);
@@ -79,11 +82,26 @@ cmd_confirm_before_exec(struct cmd *self, struct cmdq_item *item)
 	if (wait)
 		cdata->item = item;
 
+	cdata->default_yes = args_has(args, 'y');
+	if ((confirm_key = args_get(args, 'c')) != NULL) {
+		if (confirm_key[1] == '\0' &&
+		    confirm_key[0] > 31 &&
+		    confirm_key[0] < 127)
+			cdata->confirm_key = confirm_key[0];
+		else {
+			cmdq_error(item, "invalid confirm key");
+			return (CMD_RETURN_ERROR);
+		}
+	}
+	else
+		cdata->confirm_key = 'y';
+
 	if ((prompt = args_get(args, 'p')) != NULL)
 		xasprintf(&new_prompt, "%s ", prompt);
 	else {
 		cmd = cmd_get_entry(cmd_list_first(cdata->cmdlist))->name;
-		xasprintf(&new_prompt, "Confirm '%s'? (y/n) ", cmd);
+		xasprintf(&new_prompt, "Confirm '%s'? (%c/n) ",
+		cmd, cdata->confirm_key);
 	}
 
 	status_prompt_set(tc, target, new_prompt, NULL,
@@ -107,9 +125,9 @@ cmd_confirm_before_callback(struct client *c, void *data, const char *s,
 	if (c->flags & CLIENT_DEAD)
 		goto out;
 
-	if (s == NULL || *s == '\0')
+	if (s == NULL)
 		goto out;
-	if (tolower((u_char)s[0]) != 'y' || s[1] != '\0')
+	if (s[0] != cdata->confirm_key && (s[0] != '\0' || !cdata->default_yes))
 		goto out;
 	retcode = 0;
 
@@ -123,12 +141,12 @@ cmd_confirm_before_callback(struct client *c, void *data, const char *s,
 	}
 
 out:
-        if (item != NULL) {
-                if (cmdq_get_client(item) != NULL &&
-                    cmdq_get_client(item)->session == NULL)
-                        cmdq_get_client(item)->retval = retcode;
-                cmdq_continue(item);
-        }
+	if (item != NULL) {
+		if (cmdq_get_client(item) != NULL &&
+		    cmdq_get_client(item)->session == NULL)
+			cmdq_get_client(item)->retval = retcode;
+		cmdq_continue(item);
+	}
 	return (0);
 }
 
diff --git a/tmux.1 b/tmux.1
index 5cff0f24..92e2915f 100644
--- a/tmux.1
+++ b/tmux.1
@@ -5810,7 +5810,8 @@ the prompt is shown in the background and the invoking client does not exit
 until it is dismissed.
 .Tg confirm
 .It Xo Ic confirm-before
-.Op Fl b
+.Op Fl by
+.Op Fl c Ar confirm-key
 .Op Fl p Ar prompt
 .Op Fl t Ar target-client
 .Ar command
@@ -5831,6 +5832,14 @@ With
 .Fl b ,
 the prompt is shown in the background and the invoking client does not exit
 until it is dismissed.
+.Fl y
+changes the default behaviour (if Enter alone is pressed) of the prompt to
+run the command.
+.Fl c
+changes the confirmation key to
+.Ar confirm-key ;
+the default is
+.Ql y .
 .Tg menu
 .It Xo Ic display-menu
 .Op Fl O
diff --git a/tty-term.c b/tty-term.c
index 6eb56ec5..7dbcfee7 100644
--- a/tty-term.c
+++ b/tty-term.c
@@ -777,8 +777,10 @@ tty_term_string_i(struct tty_term *term, enum tty_code_code code, int a)
 #else
 	s = tparm((char *)x, a, 0, 0, 0, 0, 0, 0, 0, 0);
 #endif
-	if (s == NULL)
-		fatalx("could not expand %s", tty_term_codes[code].name);
+	if (s == NULL) {
+		log_debug("could not expand %s", tty_term_codes[code].name);
+		return ("");
+	}
 	return (s);
 }
 
@@ -794,8 +796,10 @@ tty_term_string_ii(struct tty_term *term, enum tty_code_code code, int a, int b)
 #else
 	s = tparm((char *)x, a, b, 0, 0, 0, 0, 0, 0, 0);
 #endif
-	if (s == NULL)
-		fatalx("could not expand %s", tty_term_codes[code].name);
+	if (s == NULL) {
+		log_debug("could not expand %s", tty_term_codes[code].name);
+		return ("");
+	}
 	return (s);
 }
 
@@ -812,8 +816,10 @@ tty_term_string_iii(struct tty_term *term, enum tty_code_code code, int a,
 #else
 	s = tparm((char *)x, a, b, c, 0, 0, 0, 0, 0, 0);
 #endif
-	if (s == NULL)
-		fatalx("could not expand %s", tty_term_codes[code].name);
+	if (s == NULL) {
+		log_debug("could not expand %s", tty_term_codes[code].name);
+		return ("");
+	}
 	return (s);
 }
 
@@ -829,8 +835,10 @@ tty_term_string_s(struct tty_term *term, enum tty_code_code code, const char *a)
 #else
 	s = tparm((char *)x, (long)a, 0, 0, 0, 0, 0, 0, 0, 0);
 #endif
-	if (s == NULL)
-		fatalx("could not expand %s", tty_term_codes[code].name);
+	if (s == NULL) {
+		log_debug("could not expand %s", tty_term_codes[code].name);
+		return ("");
+	}
 	return (s);
 }
 
@@ -847,8 +855,10 @@ tty_term_string_ss(struct tty_term *term, enum tty_code_code code,
 #else
 	s = tparm((char *)x, (long)a, (long)b, 0, 0, 0, 0, 0, 0, 0);
 #endif
-	if (s == NULL)
-		fatalx("could not expand %s", tty_term_codes[code].name);
+	if (s == NULL) {
+		log_debug("could not expand %s", tty_term_codes[code].name);
+		return ("");
+	}
 	return (s);
 }