diff --git a/src/libsodium/crypto_pwhash/crypto_pwhash.c b/src/libsodium/crypto_pwhash/crypto_pwhash.c
index 3bccfe2b..878ef6af 100644
--- a/src/libsodium/crypto_pwhash/crypto_pwhash.c
+++ b/src/libsodium/crypto_pwhash/crypto_pwhash.c
@@ -4,6 +4,10 @@
 
 #include "crypto_pwhash.h"
 
+#if SIZE_MAX < crypto_pwhash_MEMLIMIT_MAX
+# error Password hashing functions cannot be used on this platform
+#endif
+
 int
 crypto_pwhash_alg_argon2i13(void)
 {