--- a/src/ship_cmd.cpp	Sun Apr 01 11:11:49 2007 +0000
+++ b/src/ship_cmd.cpp	Mon Apr 02 11:35:08 2007 +0000
@@ -844,7 +844,7 @@
 	UnitID unit_num;
 	Engine *e;
 
-	if (!IsEngineBuildable(p1, VEH_SHIP, _current_player)) return_cmd_error(STR_ENGINE_NOT_BUILDABLE);
+	if (!IsEngineBuildable(p1, VEH_SHIP, _current_player)) return_cmd_error(STR_SHIP_NOT_AVAILABLE);
 
 	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);