diff --git a/extra/fuel/fuel.factor b/extra/fuel/fuel.factor
index 9d47bf8cc4..1c0dc9c480 100644
--- a/extra/fuel/fuel.factor
+++ b/extra/fuel/fuel.factor
@@ -55,14 +55,14 @@ SYMBOL: :uses-suggestions
 
 PRIVATE>
 
-: fuel-use-suggested-vocabs ( suggestions quot -- ... )
+: fuel-use-suggested-vocabs ( ..a suggestions quot: ( ..a -- ..b ) -- ..b )
     [ :uses-suggestions set ] dip
     [ try-suggested-restarts rethrow ] recover ; inline
 
 : fuel-run-file ( path -- )
     [ fuel-set-use-hook run-file ] curry with-scope ; inline
 
-: fuel-with-autouse ( ... quot: ( ... -- ... ) -- ... )
+: fuel-with-autouse ( ..a quot: ( ..a -- ..b ) -- ..b )
     [ auto-use? on fuel-set-use-hook call ] curry with-scope ; inline
 
 : fuel-get-uses ( lines -- )