diff --git a/src/apps/icon-o-matic/MainWindow.h b/src/apps/icon-o-matic/MainWindow.h
index 21f36fc4bc..bb93fd13fb 100644
--- a/src/apps/icon-o-matic/MainWindow.h
+++ b/src/apps/icon-o-matic/MainWindow.h
@@ -13,6 +13,7 @@
 
 #include "Observer.h"
 
+class BMenu;
 class BMenuBar;
 class BMenuItem;
 class CanvasView;
diff --git a/src/apps/icon-o-matic/gui/StyleView.h b/src/apps/icon-o-matic/gui/StyleView.h
index 2c7f3b2488..1d02353c31 100644
--- a/src/apps/icon-o-matic/gui/StyleView.h
+++ b/src/apps/icon-o-matic/gui/StyleView.h
@@ -13,6 +13,7 @@
 
 #include "Observer.h"
 
+class BMenu;
 class BMenuField;
 class CommandStack;
 class Gradient;