diff --git a/tool/dde_linux/create_dummies b/tool/dde_linux/create_dummies
index eb6fe75798..e126eede61 100755
--- a/tool/dde_linux/create_dummies
+++ b/tool/dde_linux/create_dummies
@@ -119,7 +119,7 @@ ifneq ($(realpath $(LINUX_KERNEL_DIR)),)
 
 # determine kernel source dir if an out-of-tree build directory is specified
 LINUX_SRC_DIR := $(LINUX_KERNEL_DIR)
-ifneq ($(shell grep "Automatically generated by" $(LINUX_KERNEL_DIR)/Makefile),)
+ifneq ($(shell grep "^\# Automatically generated by" $(LINUX_KERNEL_DIR)/Makefile),)
 LINUX_SRC_DIR := $(shell sed -n "/^include/s/.* \(.*\)\/Makefile/\\1/p" $(LINUX_KERNEL_DIR)/Makefile)
 endif