diff --git a/meta/classes-recipe/kernel-fitimage.bbclass b/meta/classes-recipe/kernel-fitimage.bbclass
index 07786647e1..c81c00f777 100644
--- a/meta/classes-recipe/kernel-fitimage.bbclass
+++ b/meta/classes-recipe/kernel-fitimage.bbclass
@@ -593,7 +593,7 @@ fitimage_assemble() {
 		for DTB in $(find "${EXTERNAL_KERNEL_DEVICETREE}" -name '*.dtb' -printf '%P\n' | sort) \
 		$(find "${EXTERNAL_KERNEL_DEVICETREE}" -name '*.dtbo' -printf '%P\n' | sort); do
 			# Set the default dtb image if it exists in the devicetree.
-			if [ ${FIT_CONF_DEFAULT_DTB} = $DTB ];then
+			if [ "${FIT_CONF_DEFAULT_DTB}" = "$DTB" ];then
 				default_dtb_image=$(echo "$DTB" | tr '/' '_')
 			fi