diff --git a/kerberos5/lib/libkrb5/Makefile b/kerberos5/lib/libkrb5/Makefile
index f1665298e09..29653388b1c 100644
--- a/kerberos5/lib/libkrb5/Makefile
+++ b/kerberos5/lib/libkrb5/Makefile
@@ -372,6 +372,8 @@ SRCS=	acache.c \
 
 SRCS+=	heim_err.c \
 	heim_err.h \
+	hx509_err.c \
+	hx509_err.h \
 	k524_err.c \
 	k524_err.h \
 	krb5_err.c \