diff --git a/meta-phosphor/classes/phosphor-mapperdir.bbclass b/meta-phosphor/classes/phosphor-mapperdir.bbclass
new file mode 100644
index 0000000..591b63d
--- /dev/null
+++ b/meta-phosphor/classes/phosphor-mapperdir.bbclass
@@ -0,0 +1,4 @@
+namespace_dir="${datadir}/phosphor-mapper/namespace"
+interface_dir="${datadir}/phosphor-mapper/interface"
+blacklist_dir="${datadir}/phosphor-mapper/blacklist"
+interfaceblacklist_dir="${datadir}/phosphor-mapper/interfaceblacklist"