diff --git a/src/epub/css/local.css b/src/epub/css/local.css
index 205ae24..47f1e23 100644
--- a/src/epub/css/local.css
+++ b/src/epub/css/local.css
@@ -8,7 +8,7 @@ article,
 	break-after: page;
 }
 
-[epub:type~="z3998:signature"]{
+[epub|type~="z3998:signature"]{
 	font-variant: small-caps;
 }