diff --git a/package/network/utils/iptables/Makefile b/package/network/utils/iptables/Makefile
index dbb40f36..c503bc53 100755
--- a/package/network/utils/iptables/Makefile
+++ b/package/network/utils/iptables/Makefile
@@ -556,12 +556,11 @@ endif
 
 ifeq ("$(CONFIG_KERNEL_ZYXEL_EXT_MARK)", "y")
 define Build/Prepare
-	# netfilter module for zoned firewall - bpan
-	$(call Build/Prepare/Default)
-	$(CP) ./src-$(PKG_VERSION)/libxt_zextmark.c $(PKG_BUILD_DIR)/extensions/
-	$(CP) ./src-$(PKG_VERSION)/libxt_ZEXTMARK.c $(PKG_BUILD_DIR)/extensions/
-	$(CP) ./src-$(PKG_VERSION)/libxt_CONNZEXTMARK.c $(PKG_BUILD_DIR)/extensions/
-	$(CP) ./src-$(PKG_VERSION)/libxt_connzextmark.c $(PKG_BUILD_DIR)/extensions/
+    $(call Build/Prepare/Default)
+    $(CP) ./src-$(PKG_VERSION)/libxt_zextmark.c $(PKG_BUILD_DIR)/extensions/
+    $(CP) ./src-$(PKG_VERSION)/libxt_zextmark.c $(PKG_BUILD_DIR)/extensions/libxt_ZEXTMARK.c
+    $(CP) ./src-$(PKG_VERSION)/libxt_connzextmark.c $(PKG_BUILD_DIR)/extensions/
+    $(CP) ./src-$(PKG_VERSION)/libxt_connzextmark.c $(PKG_BUILD_DIR)/extensions/libxt_CONNZEXTMARK.c
 endef
 endif