diff --git a/meta-digi-arm/recipes-bsp/u-boot/u-boot-dey_2015.04.bb b/meta-digi-arm/recipes-bsp/u-boot/u-boot-dey_2015.04.bb
index e48d06515..f7d9d0285 100644
--- a/meta-digi-arm/recipes-bsp/u-boot/u-boot-dey_2015.04.bb
+++ b/meta-digi-arm/recipes-bsp/u-boot/u-boot-dey_2015.04.bb
@@ -65,7 +65,7 @@ do_compile () {
                     cp  ${S}/${config}/${UBOOT_BINARY}  ${S}/${config}/u-boot-${type}.${UBOOT_SUFFIX}
 
                     # Secure boot artifacts
-                    if [ -n "${TRUSTFENCE_UBOOT_SIGN}" ]
+                    if [ "${TRUSTFENCE_UBOOT_SIGN}" = "1" ]
                     then
                         cp ${S}/${config}/u-boot-signed.imx ${S}/${config}/u-boot-signed-${type}.${UBOOT_SUFFIX}
                     fi
@@ -100,13 +100,13 @@ do_deploy_append() {
 					cd ${DEPLOYDIR}
 					rm -r ${UBOOT_BINARY}-${type} ${UBOOT_SYMLINK}-${type}
 					ln -sf u-boot-${type}-${PV}-${PR}.${UBOOT_SUFFIX} u-boot-${type}.${UBOOT_SUFFIX}
-					if [ -n "${TRUSTFENCE_UBOOT_SIGN}" ]
+					if [ "${TRUSTFENCE_UBOOT_SIGN}" = "1" ]
 					then
 						install ${S}/${config}/SRK_efuses.bin SRK_efuses-${PV}-${PR}.bin
 						install ${S}/${config}/u-boot-signed-${type}.${UBOOT_SUFFIX} u-boot-signed-${type}-${PV}-${PR}.${UBOOT_SUFFIX}
 						ln -sf u-boot-signed-${type}-${PV}-${PR}.${UBOOT_SUFFIX} u-boot-signed-${type}.${UBOOT_SUFFIX}
 						ln -sf SRK_efuses-${PV}-${PR}.bin SRK_efuses.bin
-						if [ -n "${TRUSTFENCE_UBOOT_ENCRYPT}" ]
+						if [ "${TRUSTFENCE_UBOOT_ENCRYPT}" = "1" ]
 						then
 							# Move the data encryption key in plain text directly to the deployment directory.
 							# Do not leave any other copies in the machine.
diff --git a/meta-digi-dey/classes/trustfence.bbclass b/meta-digi-dey/classes/trustfence.bbclass
index e37dc54d2..b40e5efe5 100644
--- a/meta-digi-dey/classes/trustfence.bbclass
+++ b/meta-digi-dey/classes/trustfence.bbclass
@@ -35,9 +35,9 @@ python () {
             d.appendVar("UBOOT_EXTRA_CONF", " CONFIG_CONSOLE_ENABLE_GPIO=y CONFIG_CCIMX6SBC_CONSOLE_ENABLE_GPIO_NR=%s " % d.getVar("TRUSTFENCE_CONSOLE_GPIO_ENABLE"))
 
     # Secure boot configuration
-    if d.getVar("TRUSTFENCE_CHECK_KERNEL", True):
+    if (d.getVar("TRUSTFENCE_CHECK_KERNEL", True) == "1"):
         d.appendVar("UBOOT_EXTRA_CONF", "CONFIG_SECURE_BOOT=y ")
-    if d.getVar("TRUSTFENCE_UBOOT_SIGN", True):
+    if (d.getVar("TRUSTFENCE_UBOOT_SIGN", True) == "1"):
         d.appendVar("UBOOT_EXTRA_CONF", "CONFIG_SIGN_IMAGE=y ")
         if d.getVar("TRUSTFENCE_CST_PATH", True):
             d.appendVar("UBOOT_EXTRA_CONF", 'CONFIG_CST_PATH=\\"%s\\" ' % d.getVar("TRUSTFENCE_CST_PATH"))
@@ -45,7 +45,7 @@ python () {
             d.appendVar("UBOOT_EXTRA_CONF", "CONFIG_CSF_SIZE=%s " % d.getVar("TRUSTFENCE_CSF_SIZE"))
         if d.getVar("TRUSTFENCE_KEY_INDEX", True):
             d.appendVar("UBOOT_EXTRA_CONF", "CONFIG_KEY_INDEX=%s " % d.getVar("TRUSTFENCE_KEY_INDEX"))
-        if d.getVar("TRUSTFENCE_UBOOT_ENCRYPT", True):
+        if (d.getVar("TRUSTFENCE_UBOOT_ENCRYPT", True) == "1"):
             d.appendVar("UBOOT_EXTRA_CONF", "CONFIG_ENCRYPT_IMAGE=y ")
             if d.getVar("TRUSTFENCE_UBOOT_DEK_SIZE", True):
                 d.appendVar("UBOOT_EXTRA_CONF", "CONFIG_DEK_SIZE=%s " % d.getVar("TRUSTFENCE_UBOOT_DEK_SIZE"))