diff --git a/src/libsodium/crypto_box/crypto_box_seal.c b/src/libsodium/crypto_box/crypto_box_seal.c
index f53ac369..008f8242 100644
--- a/src/libsodium/crypto_box/crypto_box_seal.c
+++ b/src/libsodium/crypto_box/crypto_box_seal.c
@@ -1,6 +1,7 @@
 
 #include <string.h>
 
+#include "core.h"
 #include "crypto_box.h"
 #include "crypto_generichash.h"
 #include "private/common.h"
diff --git a/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_seal_curve25519xchacha20poly1305.c b/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_seal_curve25519xchacha20poly1305.c
index 0e2593d7..52432771 100644
--- a/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_seal_curve25519xchacha20poly1305.c
+++ b/src/libsodium/crypto_box/curve25519xchacha20poly1305/box_seal_curve25519xchacha20poly1305.c
@@ -1,6 +1,7 @@
 
 #include <string.h>
 
+#include "core.h"
 #include "crypto_box_curve25519xchacha20poly1305.h"
 #include "crypto_generichash.h"
 #include "private/common.h"