diff --git a/src/EnvelopeEditor.cpp b/src/EnvelopeEditor.cpp
index bfb10348a..6490dbc70 100644
--- a/src/EnvelopeEditor.cpp
+++ b/src/EnvelopeEditor.cpp
@@ -8,8 +8,11 @@
 
 **********************************************************************/
 
+#include "Audacity.h"
 #include "EnvelopeEditor.h"
 
+#include "Experimental.h"
+
 #include <wx/dc.h>
 #include <wx/event.h>
 
diff --git a/src/ZoomInfo.cpp b/src/ZoomInfo.cpp
index 215e5f49c..13432e764 100644
--- a/src/ZoomInfo.cpp
+++ b/src/ZoomInfo.cpp
@@ -8,8 +8,11 @@
 
 **********************************************************************/
 
+#include "Audacity.h"
 #include "ZoomInfo.h"
 
+#include "Experimental.h"
+
 #include "prefs/GUISettings.h"
 
 namespace {