diff --git a/target/linux/cns3xxx/image/Makefile b/target/linux/cns3xxx/image/Makefile
index 9e5deecf6b..13e5efd964 100644
--- a/target/linux/cns3xxx/image/Makefile
+++ b/target/linux/cns3xxx/image/Makefile
@@ -32,7 +32,7 @@ define Image/Build
 endef
 
 define Image/Build/jffs2-64k
-	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/openwrt-$(BOARD)-$(1).img bs=64k conv=sync
+	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/$(IMG_PREFIX)-$(1).img bs=64k conv=sync
 	( \
 	dd if=$(KDIR)/uImage bs=2048k conv=sync; \
 	dd if=$(KDIR)/root.$(1) bs=64k conv=sync; \
@@ -40,7 +40,7 @@ define Image/Build/jffs2-64k
 endef
 
 define Image/Build/jffs2-128k
-	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/openwrt-$(BOARD)-$(1).img bs=128k conv=sync
+	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/$(IMG_PREFIX)-$(1).img bs=128k conv=sync
 	( \
 	dd if=$(KDIR)/uImage bs=2048k conv=sync; \
 	dd if=$(KDIR)/root.$(1) bs=128k conv=sync; \
@@ -49,7 +49,7 @@ endef
 
 define Image/Build/squashfs
 	$(call prepare_generic_squashfs,$(KDIR)/root.$(1))
-	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/openwrt-$(BOARD)-$(1).img bs=128k conv=sync
+	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/$(IMG_PREFIX)-$(1).img bs=128k conv=sync
 	( \
 	dd if=$(KDIR)/uImage bs=2048k conv=sync; \
 	dd if=$(KDIR)/root.$(1) bs=128k conv=sync; \