diff --git a/data/campaigns/World_Conquest/lua/game_mechanics/wocopedia/help_dialog.lua b/data/campaigns/World_Conquest/lua/game_mechanics/wocopedia/help_dialog.lua
index 0fb8294fdab3..4722184d4a48 100644
--- a/data/campaigns/World_Conquest/lua/game_mechanics/wocopedia/help_dialog.lua
+++ b/data/campaigns/World_Conquest/lua/game_mechanics/wocopedia/help_dialog.lua
@@ -676,7 +676,7 @@ return {
 						T.column {
 							horizontal_alignment = "right",
 							T.button {
-								label = "OK",
+								label = wesnoth.textdomain("wesnoth")("Close"),
 								id = "ok",
 							}
 						}