diff --git a/make-includes/standard_paths.make b/make-includes/standard_paths.make
index ca4c718..de42e91 100644
--- a/make-includes/standard_paths.make
+++ b/make-includes/standard_paths.make
@@ -43,3 +43,4 @@
 vpath %.pict $(IMGDIR)
 vpath %.xcf $(IMGDIR)
 vpath %.R $(IMGDIR)
+vpath %.pu $(IMGDIR)