diff --git a/meta-integrity/conf/layer.conf b/meta-integrity/conf/layer.conf
index f905b0b..6075df9 100644
--- a/meta-integrity/conf/layer.conf
+++ b/meta-integrity/conf/layer.conf
@@ -2,8 +2,7 @@
 BBPATH =. "${LAYERDIR}:"
 
 # We have a packages directory, add to BBFILES
-BBFILES := "${BBFILES} \
-            ${LAYERDIR}/recipes-*/*/*.bb \
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "integrity"