diff --git a/WindowMaker/Pixmaps/Makefile.am b/WindowMaker/Pixmaps/Makefile.am
index f970ea4a..d950c9a9 100644
--- a/WindowMaker/Pixmaps/Makefile.am
+++ b/WindowMaker/Pixmaps/Makefile.am
@@ -4,6 +4,7 @@ defsdatadir = $(pkgdatadir)/Pixmaps
 defsdata_DATA = tile.tiff \
 		tile.xpm \
 		swtile.png \
-		swback.png
+		swback.png \
+		swback-dark.png
 
 EXTRA_DIST = $(defsdata_DATA)