diff --git a/Makefile b/Makefile
index b9e2817..5a27935 100644
--- a/Makefile
+++ b/Makefile
@@ -92,7 +92,7 @@ install-ui: $(RBUI_FILES)
 	# FIXME install
 
 %_ui.rb: %.ui
-	rbuic4 $< -o $@
+	bundle exec rbuic4 $< -o $@
 	sed -e '/^module Ui/,/^end  # module Ui/d' \
 		-i $@