diff --git a/basis/ui/tools/listener/completion/completion-tests.factor b/basis/ui/tools/listener/completion/completion-tests.factor
index 5b79e918b5..b26555df6d 100644
--- a/basis/ui/tools/listener/completion/completion-tests.factor
+++ b/basis/ui/tools/listener/completion/completion-tests.factor
@@ -5,8 +5,12 @@ IN: ui.tools.listener.completion.tests
 
 [ f ] [ { "USE:" "A" "B" "C" } complete-vocab? ] unit-test
 
+[ f ] [ { "USE:" "A" "B" } complete-vocab? ] unit-test
+
 [ t ] [ { "USE:" "A" } complete-vocab? ] unit-test
 
+[ t ] [ { "USE:" } complete-vocab? ] unit-test
+
 [ t ] [ { "UNUSE:" "A" } complete-vocab? ] unit-test
 
 [ t ] [ { "QUALIFIED:" "A" } complete-vocab? ] unit-test
@@ -17,4 +21,4 @@ IN: ui.tools.listener.completion.tests
 
 [ f ] [ { "USING:" "A" "B" "C" ";" } complete-vocab-list? ] unit-test
 
-[ t ] [ { "X" ";" "USING:" "A" "B" "C" } complete-vocab-list? ] unit-test
\ No newline at end of file
+[ t ] [ { "X" ";" "USING:" "A" "B" "C" } complete-vocab-list? ] unit-test
diff --git a/basis/ui/tools/listener/completion/completion.factor b/basis/ui/tools/listener/completion/completion.factor
index c303c1f34c..c63680b188 100644
--- a/basis/ui/tools/listener/completion/completion.factor
+++ b/basis/ui/tools/listener/completion/completion.factor
@@ -76,8 +76,12 @@ M: vocab-completion row-color
     drop vocab? COLOR: black COLOR: dark-gray ? ;
 
 : complete-vocab? ( tokens -- ? )
-    1 short head* 2 short tail*
-    { "IN:" "USE:" "UNUSE:" "QUALIFIED:" "QUALIFIED-WITH:" } intersects? ;
+    harvest 2 short tail* [ f ] [
+        [
+            { "IN:" "USE:" "UNUSE:" "QUALIFIED:" "QUALIFIED-WITH:" }
+            member?
+        ] any?
+    ] if-empty ;
 
 : chop-; ( seq -- seq' )
     { ";" } split1-last [ ] [ ] ?if ;