diff --git a/arch/arm/src/imx6/Make.defs b/arch/arm/src/imx6/Make.defs
index ae9e98df5b..ad28670853 100644
--- a/arch/arm/src/imx6/Make.defs
+++ b/arch/arm/src/imx6/Make.defs
@@ -75,6 +75,10 @@ CMN_CSRCS += arm_prefetchabort.c arm_releasepending.c arm_reprioritizertr.c
 CMN_CSRCS += arm_schedulesigaction.c arm_sigdeliver.c arm_syscall.c
 CMN_CSRCS += arm_unblocktask.c arm_undefinedinsn.c
 
+ifeq ($(CONFIG_ARM_SEMIHOSTING_HOSTFS),y)
+CMN_CSRCS += up_hostfs.c
+endif
+
 ifneq ($(CONFIG_ARCH_IDLE_CUSTOM),y)
 CMN_CSRCS += imx_idle.c
 endif