diff --git a/target/sdk/Makefile b/target/sdk/Makefile
index a2cd3a5..1c696d5 100644
--- a/target/sdk/Makefile
+++ b/target/sdk/Makefile
@@ -108,6 +108,7 @@ $(BIN_DIR)/$(SDK_NAME).tar.bz2: clean
 	cat $(TOPDIR)/feeds.conf.default \
 		>> $(SDK_BUILD_DIR)/feeds.conf.default
 	$(SED) 's,^# REVISION:=.*,REVISION:=$(REVISION),g' $(SDK_BUILD_DIR)/include/version.mk
+	$(SED) '/LINUX_VERMAGIC:=/ { s,unknown,$(LINUX_VERMAGIC),g }' $(SDK_BUILD_DIR)/include/kernel.mk
 	find $(SDK_BUILD_DIR) -name .git | $(XARGS) rm -rf
 	find $(SDK_BUILD_DIR) -name .svn | $(XARGS) rm -rf
 	find $(SDK_BUILD_DIR) -name CVS | $(XARGS) rm -rf