diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index bb43432..a595022 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -722,6 +722,7 @@ set(
 	txt_db/txt_db.c
 	ui/ui_err.c
 	ui/ui_lib.c
+	ui/ui_null.c
 	ui/ui_util.c
 	whrlpool/wp_dgst.c
 	x509/by_dir.c
diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index e380fdf..7105ae4 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -953,6 +953,7 @@ libcrypto_la_SOURCES += txt_db/txt_db.c
 # ui
 libcrypto_la_SOURCES += ui/ui_err.c
 libcrypto_la_SOURCES += ui/ui_lib.c
+libcrypto_la_SOURCES += ui/ui_null.c
 if !HOST_WIN
 libcrypto_la_SOURCES += ui/ui_openssl.c
 endif