diff --git a/src/libsodium/crypto_pwhash/scryptsalsa208sha256/scrypt_platform.c b/src/libsodium/crypto_pwhash/scryptsalsa208sha256/scrypt_platform.c
index f8d8e8bf..cddf964f 100644
--- a/src/libsodium/crypto_pwhash/scryptsalsa208sha256/scrypt_platform.c
+++ b/src/libsodium/crypto_pwhash/scryptsalsa208sha256/scrypt_platform.c
@@ -27,6 +27,10 @@
 #include "crypto_scrypt.h"
 #include "runtime.h"
 
+#if !defined(MAP_ANON) && defined(MAP_ANONYMOUS)
+# define MAP_ANON MAP_ANONYMOUS
+#endif
+
 void *
 alloc_region(escrypt_region_t * region, size_t size)
 {