diff --git a/Makefile b/Makefile
index 4b76af7..a4fac91 100644
--- a/Makefile
+++ b/Makefile
@@ -83,7 +83,7 @@ $(bbl): $(pk_srcdir) $(vmlinux_stripped)
 	cd $(pk_wrkdir) && $</configure \
 		--host=$(target) \
 		--with-payload=$(vmlinux_stripped)
-	CFLAGS="-mabi=lp64 -march=rv64imac" $(MAKE) -C $(pk_wrkdir)
+	CFLAGS="-mabi=lp64 -march=rv64imac -DDISABLED_HART_MASK=1" $(MAKE) -C $(pk_wrkdir)
 
 $(bin): $(bbl)
 	$(target)-objcopy -S -O binary --change-addresses -0x80000000 $< $@
diff --git a/riscv-pk b/riscv-pk
index a2c8937..8197cad 160000
--- a/riscv-pk
+++ b/riscv-pk
@@ -1 +1 @@
-Subproject commit a2c8937e631f7531c3d59e4f179369f51eb44d19
+Subproject commit 8197cad40c5af8e4e315429be9f20aefbcc803ee