diff --git a/apps/openmw-mp/Script/Functions/GUI.cpp b/apps/openmw-mp/Script/Functions/GUI.cpp
index 1dafa9211..f613883d9 100644
--- a/apps/openmw-mp/Script/Functions/GUI.cpp
+++ b/apps/openmw-mp/Script/Functions/GUI.cpp
@@ -9,7 +9,7 @@
 
 
 
-void GUIFunctions::MessageBox(unsigned short pid, int id, const char *label) noexcept
+void GUIFunctions::_MessageBox(unsigned short pid, int id, const char *label) noexcept
 {
     Player *player;
     GET_PLAYER(pid, player,);
diff --git a/apps/openmw-mp/Script/Functions/GUI.hpp b/apps/openmw-mp/Script/Functions/GUI.hpp
index 5eef410e8..b3cfbb51d 100644
--- a/apps/openmw-mp/Script/Functions/GUI.hpp
+++ b/apps/openmw-mp/Script/Functions/GUI.hpp
@@ -6,7 +6,7 @@
 #define OPENMW_GUI_HPP
 
 #define GUIFUNCTIONS \
-    {"MessageBox",          GUIFunctions::MessageBox},\
+    {"_MessageBox",          GUIFunctions::_MessageBox},\
     {"CustomMessageBox",    GUIFunctions::CustomMessageBox},\
     {"InputDialog",         GUIFunctions::InputDialog},\
     {"SetMapVisibility",    GUIFunctions::SetMapVisibility},\
@@ -15,7 +15,7 @@
 class GUIFunctions
 {
 public:
-    static void MessageBox(unsigned short pid, int id, const char *label) noexcept;
+    static void _MessageBox(unsigned short pid, int id, const char *label) noexcept;
     static void CustomMessageBox(unsigned short pid, int id, const char *label, const char *buttons) noexcept;
     static void InputDialog(unsigned short pid, int id, const char *label) noexcept;