diff --git a/specification/dart.sty b/specification/dart.sty
index 4b7238242..ac089e532 100644
--- a/specification/dart.sty
+++ b/specification/dart.sty
@@ -412,7 +412,7 @@
 % the spacer argument.
 \newcommand{\RawFunctionTypeNamed}[9]{%
   \RawFunctionType{#1}{#2}{#3}{#4}{%
-    \FunctionTypeNamedParameters{#5}{#6}{#7}{#8}{r}}}
+    \FunctionTypeNamedParameters{#5}{#6}{#7}{#8}{#9}}}
 
 % A variant of \FunctionTypeNamed that uses the standard symbols,
 % that is, a function type with positional optional parameters which