diff --git a/doc/scsh-manual/decls.tex b/doc/scsh-manual/decls.tex
index b59db7c..fa71799 100644
--- a/doc/scsh-manual/decls.tex
+++ b/doc/scsh-manual/decls.tex
@@ -239,7 +239,7 @@
      \bgroup\begin{list}{}{\topsep=0pt\parskip=0pt}\item[]}
     {\end{list}\leavevmode\egroup\global\@ignoretrue}
 
-\newcommand{\defun}   [3] {\dfn{#1}{#2}{#3}{procedure}}  % preskip
+\def\defun#1#2#3{\dfn{#1}{#2}{#3}{procedure}}  % preskip
 \newcommand{\defunx}[3]{\dfnx{#1}{#2}{#3}{procedure}} % no skip
 
 \newenvironment{defundescx}[3]%