diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S
index 00461b00..d788f0cd 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder.S
@@ -17,6 +17,7 @@ ASM_HIDE_SYMBOL _ladder
 ladder:
 _ladder:
 
+vzeroupper
 mov %rsp,%r11
 and $31,%r11
 add $1856,%r11
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S
index c3094185..ca1abe2b 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/ladder_base.S
@@ -17,6 +17,7 @@ ASM_HIDE_SYMBOL _ladder_base
 ladder_base:
 _ladder_base:
 
+vzeroupper
 mov %rsp,%r11
 and $31,%r11
 add $1568,%r11