diff --git a/Barotrauma/BarotraumaShared/Lua/DefaultLib/LibClient.lua b/Barotrauma/BarotraumaShared/Lua/DefaultLib/LibClient.lua
index 7262c50b7..2c0aed733 100644
--- a/Barotrauma/BarotraumaShared/Lua/DefaultLib/LibClient.lua
+++ b/Barotrauma/BarotraumaShared/Lua/DefaultLib/LibClient.lua
@@ -32,6 +32,7 @@ defaultLib["GUI"] = {
     ScrollBar = CreateStatic("Barotrauma.GUIScrollBar", true),
     DropDown = CreateStatic("Barotrauma.GUIDropDown", true),
     NumberInput = CreateStatic("Barotrauma.GUINumberInput", true),
+    MessageBox = CreateStatic("Barotrauma.GUIMessageBox", true),
 
     Screen = CreateStatic("Barotrauma.Screen"),
 
diff --git a/Barotrauma/BarotraumaShared/Lua/DefaultRegister/RegisterClient.lua b/Barotrauma/BarotraumaShared/Lua/DefaultRegister/RegisterClient.lua
index ffbee7614..16e84f11b 100644
--- a/Barotrauma/BarotraumaShared/Lua/DefaultRegister/RegisterClient.lua
+++ b/Barotrauma/BarotraumaShared/Lua/DefaultRegister/RegisterClient.lua
@@ -41,5 +41,7 @@ RegisterBarotrauma("GUIListBox")
 RegisterBarotrauma("GUIScrollBar")
 RegisterBarotrauma("GUIDropDown")
 RegisterBarotrauma("GUINumberInput")
+RegisterBarotrauma("GUIMessage")
+RegisterBarotrauma("GUIMessageBox")
 
 RegisterBarotrauma("Inventory+SlotReference")
\ No newline at end of file