diff --git a/conf/layer.conf b/conf/layer.conf
index fc6453c..6bc20a4 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -6,7 +6,7 @@
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "openpower-layer"
-BBFILE_PATTERN_openpower-layer = "^${LAYERDIR}/"
+BBFILE_PATTERN_openpower-layer := "^${LAYERDIR}/"
 LAYERVERSION_openpower-layer = "1"
 LAYERSERIES_COMPAT_openpower-layer = "thud warrior"