diff --git a/LEGO1/lego/legoomni/include/registrationbook.h b/LEGO1/lego/legoomni/include/registrationbook.h
index fa610016..a28ffe5e 100644
--- a/LEGO1/lego/legoomni/include/registrationbook.h
+++ b/LEGO1/lego/legoomni/include/registrationbook.h
@@ -77,7 +77,7 @@ class RegistrationBook : public LegoWorld {
 	undefined4 m_unk0x2cc;              // 0x2cc
 
 	MxLong HandleEndAction(MxEndActionNotificationParam& p_param);
-	MxLong HandleKeyPress(char p_key);
+	MxLong HandleKeyPress(MxS8 p_key);
 	MxLong HandleClick(LegoControlManagerEvent& p_param);
 	MxLong HandleNotification19(MxParam& p_param);
 };
diff --git a/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp b/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp
index c5d87ed5..d8ae7003 100644
--- a/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp
+++ b/LEGO1/lego/legoomni/src/infocenter/registrationbook.cpp
@@ -98,7 +98,7 @@ MxLong RegistrationBook::HandleEndAction(MxEndActionNotificationParam& p_param)
 }
 
 // STUB: LEGO1 0x100772d0
-MxLong RegistrationBook::HandleKeyPress(char p_key)
+MxLong RegistrationBook::HandleKeyPress(MxS8 p_key)
 {
 	return 0;
 }