diff --git a/layout.sty b/layout.sty
index a7b6322ea15a15966fc838d6b1f54b92f9cf061c..0fa5820399acaa6426ca5c949cd13c909ec233e9 100644
--- a/layout.sty
+++ b/layout.sty
@@ -335,7 +335,7 @@ bookmarks=true]%
 \newcommand\roll[2]{%
   \setcounter{tn}{7}%
   \addtocounter{tn}{\value{#1}}%
-  \ifdefcounter{#2}{\addtocounter{tn}{\value{#2}}}{}%
+  \ifltxcounter{#2}{\addtocounter{tn}{\value{#2}}}{}%
   #1~+~#2%
 }