diff --git a/src/libsodium/crypto_stream/salsa20/ref/stream_salsa20_ref.c b/src/libsodium/crypto_stream/salsa20/ref/stream_salsa20_ref.c
index 008d8daf..aa00c8d5 100644
--- a/src/libsodium/crypto_stream/salsa20/ref/stream_salsa20_ref.c
+++ b/src/libsodium/crypto_stream/salsa20/ref/stream_salsa20_ref.c
@@ -10,7 +10,7 @@ Public domain.
 #include "crypto_stream_salsa20.h"
 #include "utils.h"
 
-#ifndef HAVE_AMD64_ASM
+#if !(defined(HAVE_EMMINTRIN_H) && defined(__x86_64__))
 
 static int
 stream_ref(unsigned char *c, unsigned long long clen,