diff --git a/src/protocol/Makefile.am b/src/protocol/Makefile.am
index 47246595..18d1971b 100644
--- a/src/protocol/Makefile.am
+++ b/src/protocol/Makefile.am
@@ -69,7 +69,8 @@ libnoiseprotocol_a_SOURCES += \
 else !USE_OPENSSL
 if USE_LIBSODIUM
 libnoiseprotocol_a_SOURCES += \
-	../backend/sodium/cipher-aesgcm.c
+	../backend/sodium/cipher-aesgcm.c \
+	../backend/ref/cipher-aesgcm.c
 else
 libnoiseprotocol_a_SOURCES += \
 	../backend/ref/cipher-aesgcm.c
@@ -79,6 +80,7 @@ endif
 if USE_LIBSODIUM
 libnoiseprotocol_a_SOURCES += \
 	rand_sodium.c \
+	../crypto/ghash/ghash.c \
 	../backend/sodium/cipher-aesgcm.c \
 	../backend/sodium/cipher-chachapoly.c \
 	../backend/sodium/dh-curve25519.c \