diff --git a/configure.in b/configure.in
index 93a447919da..e12214524fa 100644
--- a/configure.in
+++ b/configure.in
@@ -1732,7 +1732,7 @@ then
 fi
 
 AC_ARG_WITH(debug,
-    [AS_HELP_STRING([--with-debug], [Add debug code @<:@default=no@:>@])]
+    [AS_HELP_STRING([--with-debug], [Add debug code @<:@default=no@:>@])],
     [with_debug=$withval],
     [with_debug=no])
 if test "$with_debug" = "yes"