diff --git a/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c b/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
index 00138e04..3a187288 100644
--- a/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
+++ b/src/libsodium/crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c
@@ -9,6 +9,7 @@
 #include "crypto_verify_16.h"
 #include "export.h"
 #include "private/common.h"
+#include "private/sse2_64_32.h"
 #include "randombytes.h"
 #include "runtime.h"
 #include "utils.h"