diff --git a/src/gui/gui.h b/src/gui/gui.h
index 73fc4d87..174039d0 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -918,6 +918,7 @@ class FurnaceGUI {
   std::vector<ActiveNote> activeNotes;
   std::vector<DivCommand> cmdStream;
   std::vector<Particle> particles;
+  std::vector<DivInstrument*> pendingIns;
 
   std::vector<FurnaceGUISysCategory> sysCategories;