diff --git a/debian/rules b/debian/rules
index 914c69c..c0a0e65 100755
--- a/debian/rules
+++ b/debian/rules
@@ -20,7 +20,7 @@ ENABLED=debian/shellinabox/etc/shellinabox/options-enabled
 override_dh_install:
 	dh_install
 	install -D -m644 shellinabox/black-on-white.css "$(AVAILABLE)/00+Black on White.css"
-	install -D -m644 shellinabox/white-on-black.css "$(AVAILABLE)/00_White On Black.css"
+	install -D -m644 shellinabox/white-on-black.css "$(AVAILABLE)/00_White on Black.css"
 	install -D -m644 shellinabox/color.css          "$(AVAILABLE)/01+Color Terminal.css"
 	install -D -m644 shellinabox/monochrome.css     "$(AVAILABLE)/01_Monochrome.css"
 	install -D -m644 debian/README.available        "$(AVAILABLE)/README"