diff --git a/src/widgets/Ruler.cpp b/src/widgets/Ruler.cpp
index 10b928ac3..c9c15a4e6 100644
--- a/src/widgets/Ruler.cpp
+++ b/src/widgets/Ruler.cpp
@@ -77,6 +77,7 @@ array of Ruler::Label.
 #include "../TrackPanel.h"
 #include "../Menus.h"
 #include "../Prefs.h"
+#include "../Snap.h"
 
 #define max(a,b)  ( (a<b)?b:a )
 
diff --git a/src/widgets/Ruler.h b/src/widgets/Ruler.h
index a83dfe92e..7e9677f3b 100644
--- a/src/widgets/Ruler.h
+++ b/src/widgets/Ruler.h
@@ -18,11 +18,11 @@
 #include <wx/window.h>
 #include "../Envelope.h"
 #include "../Experimental.h"
-#include "../Snap.h"
 
 struct ViewInfo;
 class AudacityProject;
 class TimeTrack;
+class SnapManager;
 
 class AUDACITY_DLL_API Ruler {
  public: