diff --git a/core/inference/class/class-tests.factor b/core/inference/class/class-tests.factor
index e7fcbfcb08..67b8616c61 100755
--- a/core/inference/class/class-tests.factor
+++ b/core/inference/class/class-tests.factor
@@ -4,7 +4,7 @@ inference.dataflow optimizer tools.test kernel.private generic
 sequences words inference.class quotations alien
 alien.c-types strings sbufs sequences.private
 slots.private combinators definitions compiler.units
-system layouts ;
+system layouts vectors ;
 
 ! Make sure these compile even though this is invalid code
 [ ] [ [ 10 mod 3.0 /i ] dataflow optimize drop ] unit-test