diff --git a/conf/layer.conf b/conf/layer.conf
index 32e1827..e8b87b2 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -2,7 +2,7 @@
 BBPATH .= ":${LAYERDIR}"
 
 # We have a recipes directory containing .bb and .bbappend files, add to BBFILES
-BBFILES := "${BBFILES} ${LAYERDIR}/recipes*/*/*.bb \ 
+BBFILES += "${LAYERDIR}/recipes*/*/*.bb \
             ${LAYERDIR}/recipes*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "raspberrypi"