diff --git a/crypto/ec/curve25519.c b/crypto/ec/curve25519.c
index aa999cc5914e5c2b0973501bc9327c7e1ad31bcc..c5d887ec4cd49fb84680f28b9ef3133f24d28346 100644
--- a/crypto/ec/curve25519.c
+++ b/crypto/ec/curve25519.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -254,6 +254,7 @@ static void x25519_scalar_mulx(uint8_t out[32], const uint8_t scalar[32],
 #if defined(X25519_ASM) \
     || ( (defined(__SIZEOF_INT128__) && __SIZEOF_INT128__ == 16) \
          && !defined(__sparc__) \
+         && (!defined(__SIZEOF_LONG__) || (__SIZEOF_LONG__ == 8)) \
          && !(defined(__ANDROID__) && !defined(__clang__)) )
 /*
  * Base 2^51 implementation. It's virtually no different from reference
diff --git a/crypto/ec/curve448/curve448utils.h b/crypto/ec/curve448/curve448utils.h
index 9bf837993c94bf900ccd5a7e68553d761927fe76..9032bb4f730ada1a25e1aeeae6f31801f65258fd 100644
--- a/crypto/ec/curve448/curve448utils.h
+++ b/crypto/ec/curve448/curve448utils.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
  * Copyright 2015 Cryptography Research, Inc.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
@@ -24,7 +24,9 @@
  */
 # ifndef C448_WORD_BITS
 #  if (defined(__SIZEOF_INT128__) && (__SIZEOF_INT128__ == 16)) \
-      && !defined(__sparc__)
+      && !defined(__sparc__) \
+      && (!defined(__SIZEOF_LONG__) || (__SIZEOF_LONG__ == 8))
+
 #   define C448_WORD_BITS 64      /* The number of bits in a word */
 #  else
 #   define C448_WORD_BITS 32      /* The number of bits in a word */