diff --git a/panda/src/tform/Sources.pp b/panda/src/tform/Sources.pp
index 4b446bec05..e403fc45c5 100644
--- a/panda/src/tform/Sources.pp
+++ b/panda/src/tform/Sources.pp
@@ -26,6 +26,7 @@
   #define INSTALL_HEADERS \
     buttonThrower.h dataValve.I dataValve.h \
     driveInterface.I driveInterface.h mouseWatcher.I mouseWatcher.h \
+    mouseWatcherGroup.h \
     mouseWatcherParameter.I mouseWatcherParameter.h \
     mouseWatcherRegion.I mouseWatcherRegion.h \
     planarSlider.h trackball.h transform2sg.h