--- a/dungeon.c	2016-02-07 20:12:39.258150130 +0100
+++ b/dungeon.c	2016-02-07 20:12:58.239805610 +0100
@@ -1489,7 +1489,7 @@
 	{
 		char buf[20];
 
-		sprintf(buf, get_day(bst(YEAR, turn) + START_YEAR));
+		sprintf(buf, "%s", get_day(bst(YEAR, turn) + START_YEAR));
 		cmsg_format(TERM_L_GREEN,
 		            "Today it is %s of the %s year of the third age.",
 		            get_month_name(bst(DAY, turn), wizard, FALSE), buf);
--- a/files.c	2016-02-07 20:15:07.736451417 +0100
+++ b/files.c	2016-02-07 20:15:27.595089867 +0100
@@ -4856,7 +4856,7 @@
 
 	/* Terminate */
 	tmp[k] = '\0';
-	sprintf(player_base, tmp);
+	sprintf(player_base, "%s", tmp);
 
 	/* Require a "base" name */
 	if (!player_base[0]) strcpy(player_base, "PLAYER");
--- a/lua_bind.c	2016-02-07 20:09:29.071592178 +0100
+++ b/lua_bind.c	2016-02-07 20:10:48.094164373 +0100
@@ -490,7 +490,7 @@
 /* Files */
 void lua_print_hook(cptr str)
 {
-	fprintf(hook_file, str);
+	fprintf(hook_file, "%s", str);
 }
 
 
--- a/plots.c	2016-02-07 20:11:35.389308152 +0100
+++ b/plots.c	2016-02-07 20:12:19.247513152 +0100
@@ -93,7 +93,7 @@
 	{
 		MAKE(new, hooks_chain);
 		new->hook = hook;
-		sprintf(new->name, name);
+		sprintf(new->name, "%s", name);
 #ifdef DEBUG_HOOK
 		if (wizard) cmsg_format(TERM_VIOLET, "HOOK ADD: %s", name);
 		if (take_notes) add_note(format("HOOK ADD: %s", name), 'D');
--- a/spells1.c	2016-02-07 20:15:47.277731397 +0100
+++ b/spells1.c	2016-02-07 20:16:03.373438169 +0100
@@ -7312,7 +7312,7 @@
 
 	if (who == -2)
 	{
-		sprintf(killer, t_name + t_info[cave[p_ptr->py][p_ptr->px].t_idx].name);
+		sprintf(killer, "%s", t_name + t_info[cave[p_ptr->py][p_ptr->px].t_idx].name);
 	}
 
 	/* Analyze the damage */
--- a/squeltch.c	2016-02-07 20:13:11.872558078 +0100
+++ b/squeltch.c	2016-02-07 20:13:42.707997918 +0100
@@ -399,7 +399,7 @@
 
 				if (!max) continue;
 
-				sprintf(name, string_exec_lua(format("return __rules[%d].table.args.name", sel)));
+				sprintf(name, "%s", string_exec_lua(format("return __rules[%d].table.args.name", sel)));
 				if (input_box("New name?", hgt / 2, wid / 2, name, 15))
 				{
 					exec_lua(format("auto_aux:rename_rule(%d, '%s')", sel, name));
--- a/util.c	2016-02-07 20:14:22.786269296 +0100
+++ b/util.c	2016-02-07 20:16:44.227693551 +0100
@@ -4468,7 +4468,7 @@
 		{
 			char buf2[20];
 
-			sprintf(buf2, get_day(day + 1));
+			sprintf(buf2, "%s", get_day(day + 1));
 			if (full) sprintf(buf, "%s (%s day)", month_name[i], buf2);
 			else sprintf(buf, "%s", month_name[i]);
 			break;
@@ -4479,8 +4479,8 @@
 			char buf2[20];
 			char buf3[20];
 
-			sprintf(buf2, get_day(day + 1 - month_day[i]));
-			sprintf(buf3, get_day(day + 1));
+			sprintf(buf2, "%s", get_day(day + 1 - month_day[i]));
+			sprintf(buf3, "%s", get_day(day + 1));
 
 			if (full) sprintf(buf, "%s day of %s (%s day)", buf2, month_name[i], buf3);
 			else if (compact) sprintf(buf, "%s day of %s", buf2, month_name[i]);