diff --git a/tools/osbuilder/Makefile b/tools/osbuilder/Makefile
index b70ca7a20..a35139c5a 100644
--- a/tools/osbuilder/Makefile
+++ b/tools/osbuilder/Makefile
@@ -9,7 +9,7 @@ ROOTFS_BUILDER := $(MK_DIR)/rootfs-builder/rootfs.sh
 INITRD_BUILDER := $(MK_DIR)/initrd-builder/initrd_builder.sh
 IMAGE_BUILDER  := $(MK_DIR)/image-builder/image_builder.sh
 
-DISTRO                := centos
+DISTRO                ?= centos
 BUILD_METHOD          := distro
 BUILD_METHOD_LIST     := distro dracut
 AGENT_INIT            ?= no