diff --git a/extra/compiler/cfg/gvn/avail/avail.factor b/extra/compiler/cfg/gvn/avail/avail.factor
index a60e72a2e4..fa7de59e6f 100644
--- a/extra/compiler/cfg/gvn/avail/avail.factor
+++ b/extra/compiler/cfg/gvn/avail/avail.factor
@@ -8,6 +8,7 @@ compiler.cfg.def-use
 compiler.cfg.gvn.graph
 compiler.cfg.predecessors
 compiler.cfg.rpo ;
+FROM: assocs => change-at ;
 FROM: namespaces => set ;
 IN: compiler.cfg.gvn.avail