diff --git a/render/Makefile.am b/render/Makefile.am
index f802779f..f9c87795 100644
--- a/render/Makefile.am
+++ b/render/Makefile.am
@@ -7,9 +7,9 @@ noinst_PROGRAMS=rendertest
 rendertest_SOURCES=$(librender_a_SOURCES)
 
 noinst_LIBRARIES=librender.a
-librender_a_SOURCES=render.c test.c gradient.c color.c font.c
+librender_a_SOURCES=render.c test.c gradient.c color.c font.c mask.c
 
-noinst_HEADERS=render.h gradient.h color.h font.h
+noinst_HEADERS=render.h gradient.h color.h font.h mask.h
 
 MAINTAINERCLEANFILES= Makefile.in