diff --git a/src/runtime-rs/Makefile b/src/runtime-rs/Makefile
index 7e1c787ccc..764733f7c8 100644
--- a/src/runtime-rs/Makefile
+++ b/src/runtime-rs/Makefile
@@ -314,7 +314,7 @@ ifneq (,$(FCCMD))
     DEFBLOCKSTORAGEDRIVER_FC := virtio-blk-mmio
     DEFMAXMEMSZ_FC := 2048
     DEFNETWORKMODEL_FC := tcfilter
-    KERNELPARAMS = console=ttyS0 agent.log_vport=1025
+    KERNELPARAMS_FC = console=ttyS0 agent.log_vport=1025
     KERNELTYPE_FC = uncompressed
     KERNEL_NAME_FC = $(call MAKE_KERNEL_NAME_FC,$(KERNELTYPE_FC))
     KERNELPATH_FC = $(KERNELDIR)/$(KERNEL_NAME_FC)
@@ -385,6 +385,7 @@ USER_VARS += CPUFEATURES
 USER_VARS += DEFMACHINETYPE_CLH
 USER_VARS += KERNELPARAMS
 USER_VARS += KERNELPARAMS_DB
+USER_VARS += KERNELPARAMS_FC
 USER_VARS += LIBEXECDIR
 USER_VARS += LOCALSTATEDIR
 USER_VARS += PKGDATADIR