diff --git a/conf/layer.conf b/conf/layer.conf
index a0eebb7..8d0b76b 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -2,7 +2,7 @@
 BBPATH .= ":${LAYERDIR}"
 
 BBFILE_COLLECTIONS += "ingrasys"
-BBFILE_PATTERN_ingrasys = ""
+BBFILE_PATTERN_ingrasys := "^${LAYERDIR}/"
 LAYERSERIES_COMPAT_ingrasys = "thud warrior"
 
 # Provide a variable that points the base of the ingrasys layer.