diff --git a/include/image.mk b/include/image.mk
index 788d593f94..a6237ff2e2 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -121,7 +121,7 @@ endef
 
 define Image/BuildKernel/MkFIT
 	$(TOPDIR)/scripts/mkits.sh \
-		-D $(1) -o $(KDIR)/fit-$(1).its -k $(2) -d $(3) -C $(4) -a $(5) -e $(6) \
+		-D $(1) -o $(KDIR)/fit-$(1).its -k $(2) $(if $(3),-d $(3)) -C $(4) -a $(5) -e $(6) \
 		-A $(ARCH) -v $(LINUX_VERSION)
 	PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage -f $(KDIR)/fit-$(1).its $(KDIR)/fit-$(1)$(7).itb
 endef