diff --git a/extensions/openpower-pels/openpower-pels.mk b/extensions/openpower-pels/openpower-pels.mk
index c74f205..07d7522 100644
--- a/extensions/openpower-pels/openpower-pels.mk
+++ b/extensions/openpower-pels/openpower-pels.mk
@@ -1,4 +1,5 @@
 phosphor_log_manager_SOURCES += \
+	extensions/openpower-pels/ascii_string.cpp \
 	extensions/openpower-pels/bcd_time.cpp \
 	extensions/openpower-pels/data_interface.cpp \
 	extensions/openpower-pels/entry_points.cpp \