diff --git a/src/platform/qt/MultiplayerController.h b/src/platform/qt/MultiplayerController.h
index 42de75bcb..65054fcb2 100644
--- a/src/platform/qt/MultiplayerController.h
+++ b/src/platform/qt/MultiplayerController.h
@@ -18,6 +18,9 @@
 #include <mgba/internal/gb/sio/lockstep.h>
 #endif
 
+struct GBSIOLockstepNode;
+struct GBASIOLockstepNode;
+
 namespace QGBA {
 
 class GameController;
diff --git a/src/platform/qt/OverrideView.cpp b/src/platform/qt/OverrideView.cpp
index ad0819616..39f4e5ce9 100644
--- a/src/platform/qt/OverrideView.cpp
+++ b/src/platform/qt/OverrideView.cpp
@@ -22,8 +22,10 @@
 
 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)