diff --git a/src/libsodium/crypto_pwhash/scryptxsalsa208sha256/scrypt_platform.c b/src/libsodium/crypto_pwhash/scryptxsalsa208sha256/scrypt_platform.c
index 8aa98397..6dc26c57 100644
--- a/src/libsodium/crypto_pwhash/scryptxsalsa208sha256/scrypt_platform.c
+++ b/src/libsodium/crypto_pwhash/scryptxsalsa208sha256/scrypt_platform.c
@@ -21,6 +21,7 @@
 #ifdef HAVE_SYS_MMAN_H
 # include <sys/mman.h>
 #endif
+#include <errno.h>
 #include <stdlib.h>
 
 #include "crypto_scrypt.h"