diff --git a/Makefile b/Makefile
index e85a873..5d0fa02 100644
--- a/Makefile
+++ b/Makefile
@@ -67,12 +67,12 @@ install:
 	install -m644 build/case.stl $(SHAREDIR)
 	install -m644 build/case.gcode $(SHAREDIR)
 
-%/pinephone_case.vtk: cq_toplevel.py src/*.py
+%/pinephone_case.vtk %/pinephone_case.vtk.js: cq_toplevel.py src/*.py
 	mkdir -p "$(@D)"
-	./cq_toplevel.py --export-vtk $@
-%/pinephone_phone.vtk: cq_toplevel.py src/*.py
+	./cq_toplevel.py --export-vtk $*/pinephone_case.vtk
+%/pinephone_phone.vtk %/pinephone_phone.vtk.js: cq_toplevel.py src/*.py
 	mkdir -p "$(@D)"
-	./cq_toplevel.py --render-phone-only --export-vtk $@
+	./cq_toplevel.py --render-phone-only --export-vtk $*/pinephone_phone.vtk
 
 build/web-viewer/vtk.js: doc.in/vtk.js
 	mkdir -p build/web-viewer
@@ -80,7 +80,7 @@ build/web-viewer/vtk.js: doc.in/vtk.js
 build/web-viewer/renderWindow.js: doc.in/renderWindow.js
 	mkdir -p build/web-viewer
 	cp $< $@
-build/web-viewer/index.html: doc.in/index.html build/web-viewer/vtk.js build/web-viewer/renderWindow.js build/web-viewer/pinephone_case.vtk build/web-viewer/pinephone_phone.vtk
+build/web-viewer/index.html: doc.in/index.html build/web-viewer/vtk.js build/web-viewer/renderWindow.js build/web-viewer/pinephone_case.vtk.js build/web-viewer/pinephone_phone.vtk.js
 	mkdir -p build/web-viewer
 	cp $< $@