diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/consts.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/consts.S
index b672fd85..67f1f018 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/consts.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/consts.S
@@ -1,3 +1,5 @@
+#ifdef IN_SANDY2X
+
 /*
    REDMASK51 is from amd64-51/consts.s.
 */
@@ -19,3 +21,5 @@ m26: .quad 67108863, 67108863
 subc0: .quad 0x07FFFFDA, 0x03FFFFFE
 subc2: .quad 0x07FFFFFE, 0x03FFFFFE
 REDMASK51:   .quad 0x0007FFFFFFFFFFFF
+
+#endif
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_mul.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_mul.S
index 3add6504..3b763788 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_mul.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_mul.S
@@ -1,3 +1,5 @@
+#ifdef IN_SANDY2X
+
 /*
    This file is basically amd64-51/fe25519_mul.s.
 */
@@ -183,3 +185,5 @@ add %r11,%rsp
 mov %rdi,%rax
 mov %rsi,%rdx
 ret
+
+#endif
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_nsquare.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_nsquare.S
index fd79b8f0..9b74ee3e 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_nsquare.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_nsquare.S
@@ -1,3 +1,5 @@
+#ifdef IN_SANDY2X
+
 /*
    This file is adapted from amd64-51/fe25519_square.s:
    Adding loop to perform n squares.
@@ -159,3 +161,5 @@ movq 40(%rsp),%rbx
 movq 48(%rsp),%rbp
 add %r11,%rsp
 ret
+
+#endif
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_pack.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_pack.S
index e652ace8..c8cf405b 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_pack.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/fe51_pack.S
@@ -1,3 +1,5 @@
+#ifdef IN_SANDY2X
+
 /*
    This file is the result of merging 
    amd64-51/fe25519_pack.c and amd64-51/fe25519_freeze.s.
@@ -213,3 +215,5 @@ movq 0(%rsp),%r11
 movq 8(%rsp),%r12
 add %r11,%rsp
 ret
+
+#endif
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S
index 12843d8a..0adc44af 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S
@@ -1,3 +1,5 @@
+#ifdef IN_SANDY2X
+
 #include "ladder_namespace.h"
 #include "consts_namespace.h"
 .p2align 5
@@ -1426,3 +1428,5 @@ movq 1840(%rsp),%r13
 movq 1848(%rsp),%r14
 add %r11,%rsp
 ret
+
+#endif
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S
index 404c3955..536ac101 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S
@@ -1,3 +1,5 @@
+#ifdef IN_SANDY2X
+
 #include "ladder_base_namespace.h"
 #include "consts_namespace.h"
 .p2align 5
@@ -1281,3 +1283,5 @@ movq 1544(%rsp),%r12
 movq 1552(%rsp),%r13
 add %r11,%rsp
 ret
+
+#endif
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/sandy2x.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/sandy2x.S
index dfb092ff..c955b0af 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/sandy2x.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/sandy2x.S
@@ -1,4 +1,8 @@
 
+#ifdef HAVE_AMD64_ASM
+
+#define IN_SANDY2X
+
 #include "consts.S"
 #include "fe51_mul.S"
 #include "fe51_nsquare.S"
@@ -9,3 +13,5 @@
 #if defined(__linux__) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits
 #endif
+
+#endif