diff --git a/extra/classes/struct/vectored/vectored-tests.factor b/extra/classes/struct/vectored/vectored-tests.factor
index 1b3aa86eff..4d083faa5d 100644
--- a/extra/classes/struct/vectored/vectored-tests.factor
+++ b/extra/classes/struct/vectored/vectored-tests.factor
@@ -1,6 +1,7 @@
 ! (c)2009 Joe Groff bsd license
 USING: accessors alien.c-types classes.struct classes.struct.vectored
-kernel sequences specialized-arrays tools.test ;
+kernel sequences specialized-arrays tools.test vocabs compiler.units ;
+FROM: specialized-arrays.private => specialized-array-vocab ;
 SPECIALIZED-ARRAYS: int ushort float ;
 IN: classes.struct.vectored.tests
 
@@ -71,3 +72,9 @@ VECTORED-STRUCT: foo
         { w ushort-array{ 15   25   35   45   } }
     } third vectored-element>
 ] unit-test
+
+[ ] [
+    [
+        foo specialized-array-vocab forget-vocab
+    ] with-compilation-unit
+] unit-test