diff --git a/src/game_preferences.cpp b/src/game_preferences.cpp
index 0557e604531..c8358b253ae 100644
--- a/src/game_preferences.cpp
+++ b/src/game_preferences.cpp
@@ -818,7 +818,7 @@ std::string custom_command() {
 }
 
 void set_custom_command(const std::string& command) {
-	return preferences::set("custom_command", command);
+	preferences::set("custom_command", command);
 }
 
 /**
diff --git a/src/menu_events.cpp b/src/menu_events.cpp
index 15bec5b3c2f..d56aa72f802 100644
--- a/src/menu_events.cpp
+++ b/src/menu_events.cpp
@@ -3132,7 +3132,7 @@ void console_handler::do_lua() {
 	game_events::commit();
 }
 void console_handler::do_custom() {
-	preferences::set("custom_command", get_data());
+	preferences::set_custom_command(get_data());
 }
 void console_handler::do_set_alias() {
 	const std::string data = get_data();