diff --git a/test/references/Makefile.am b/test/references/Makefile.am
index ef802915618b0a7011992b2353792ecdc6374d8c..c08c718088e8c754ba6484941c8ca396755ad3f9 100644
--- a/test/references/Makefile.am
+++ b/test/references/Makefile.am
@@ -1,4 +1,4 @@
 referencesdir = $(includedir)/test/references
-EXTRA_DIST:=$(wildcard *.vtu)
+EXTRA_DIST:=$(wildcard *.vtu) $(wildcard *.vtp)
 
 include $(top_srcdir)/am/global-rules