diff --git a/lib/des/Makefile.am b/lib/des/Makefile.am
index 1c64c32af..17b6d6b06 100644
--- a/lib/des/Makefile.am
+++ b/lib/des/Makefile.am
@@ -103,6 +103,7 @@ libhcrypto_la_SOURCES =	\
 	rsa.h		\
 	sha.c		\
 	sha.h		\
+	sha256.c	\
 	ui.c		\
 	ui.h