diff --git a/extra/fuel/help/help.factor b/extra/fuel/help/help.factor
index bf637fd0b3..64d77566b5 100644
--- a/extra/fuel/help/help.factor
+++ b/extra/fuel/help/help.factor
@@ -92,8 +92,8 @@ PRIVATE>
 
 : (fuel-word-synopsis) ( word usings -- str/f )
     [
-        [ vocab ] filter interactive-vocabs get append interactive-vocabs set
-        fuel-find-word [ synopsis ] when*
+        [ vocab ] filter interactive-vocabs [ append ] change
+        fuel-find-word [ synopsis ] [ f ] if*
     ] with-scope ;
 
 : (fuel-word-see) ( word -- elem )