diff --git a/meta-digi-arm/conf/layer.conf b/meta-digi-arm/conf/layer.conf
index 6b0c7d1b8..2d2965254 100644
--- a/meta-digi-arm/conf/layer.conf
+++ b/meta-digi-arm/conf/layer.conf
@@ -1,8 +1,8 @@
 # We have a conf and classes directory, add to BBPATH
-BBPATH := "${BBPATH}:${LAYERDIR}"
+BBPATH .= ":${LAYERDIR}"
 
 # We have a packages directory, add to BBFILES
-BBFILES := "${BBFILES} ${LAYERDIR}/recipes-*/*/*.bb \
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 # This is the FSL license agreement.
diff --git a/meta-digi-del/conf/layer.conf b/meta-digi-del/conf/layer.conf
index 1d6558b5f..350754780 100644
--- a/meta-digi-del/conf/layer.conf
+++ b/meta-digi-del/conf/layer.conf
@@ -1,8 +1,8 @@
 # We have a conf and classes directory, add to BBPATH
-BBPATH := "${BBPATH}:${LAYERDIR}"
+BBPATH .= ":${LAYERDIR}"
 
 # We have a packages directory, add to BBFILES
-BBFILES := "${BBFILES} ${LAYERDIR}/recipes-*/*/*.bb \
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "del"