diff --git a/lib/krb5/Makefile.am b/lib/krb5/Makefile.am
index f24673808..be80f48c2 100644
--- a/lib/krb5/Makefile.am
+++ b/lib/krb5/Makefile.am
@@ -37,6 +37,7 @@ libkrb5_la_SOURCES = \
 	creds.c \
 	crypto.c \
 	data.c \
+	expand_hostname.c \
 	fcache.c \
 	free.c \
 	free_host_realm.c \