diff --git a/extensions/openpower-pels/openpower-pels.mk b/extensions/openpower-pels/openpower-pels.mk
index aa69a2e..89143b2 100644
--- a/extensions/openpower-pels/openpower-pels.mk
+++ b/extensions/openpower-pels/openpower-pels.mk
@@ -12,4 +12,5 @@
 	extensions/openpower-pels/private_header.cpp \
 	extensions/openpower-pels/registry.cpp \
 	extensions/openpower-pels/repository.cpp \
+	extensions/openpower-pels/severity.cpp \
 	extensions/openpower-pels/user_header.cpp