diff --git a/pkg/server/context.go b/pkg/server/context.go
index e193a93..049ff5d 100644
--- a/pkg/server/context.go
+++ b/pkg/server/context.go
@@ -247,7 +247,7 @@ func (c *Context) File(name string) (io.Reader, string, error) {
 
 // CheckXsrf validates the xsrf token
 func (c *Context) CheckXsrf() (ok bool) {
-	ok = checkXsrf(c.Form("token"), c.Token.RawSig()[:keySize])
+	ok = checkXsrf(c.Form("token"), c.Token.RawSig())
 	if !ok {
 		c.Error("wrong csrf token")
 	}