diff --git a/build/sims/run b/build/sims/run
index f13d1f68..f76f3986 100644
--- a/build/sims/run
+++ b/build/sims/run
@@ -5,6 +5,7 @@ set cpu idle
 set cpu mpx
 set pd off
 set dpy enabled
+set imx enabled
 at ptr bin/ka10/boot/dskdmp.rim
 at dpa0 out/sims/rp03.2
 at dpa1 out/sims/rp03.3