diff --git a/src/platform/qt/MultiplayerController.h b/src/platform/qt/MultiplayerController.h
index 166fa83c0..eaf8c013a 100644
--- a/src/platform/qt/MultiplayerController.h
+++ b/src/platform/qt/MultiplayerController.h
@@ -14,6 +14,9 @@ extern "C" {
 #include "gba/sio/lockstep.h"
 }
 
+struct GBSIOLockstepNode;
+struct GBASIOLockstepNode;
+
 namespace QGBA {
 
 class GameController;
diff --git a/src/platform/qt/OverrideView.cpp b/src/platform/qt/OverrideView.cpp
index 249baac52..e27a85cfb 100644
--- a/src/platform/qt/OverrideView.cpp
+++ b/src/platform/qt/OverrideView.cpp
@@ -26,8 +26,10 @@ extern "C" {
 
 using namespace QGBA;
 
+#ifdef M_CORE_GB
 QList<enum GBModel> OverrideView::s_gbModelList;
 QList<enum GBMemoryBankControllerType> OverrideView::s_mbcList;
+#endif
 
 OverrideView::OverrideView(GameController* controller, ConfigController* config, QWidget* parent)
 	: QDialog(parent, Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint)