diff --git a/src/libsodium/crypto_core/ed25519/core_ed25519.c b/src/libsodium/crypto_core/ed25519/core_ed25519.c
index 3169ff35..15c004b9 100644
--- a/src/libsodium/crypto_core/ed25519/core_ed25519.c
+++ b/src/libsodium/crypto_core/ed25519/core_ed25519.c
@@ -137,9 +137,11 @@ void
 crypto_core_ed25519_scalar_add(unsigned char *z, const unsigned char *x,
                                const unsigned char *y)
 {
-    unsigned char x_[crypto_core_ed25519_NONREDUCEDSCALARBYTES] = { 0U };
-    unsigned char y_[crypto_core_ed25519_NONREDUCEDSCALARBYTES] = { 0U };
+    unsigned char x_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
+    unsigned char y_[crypto_core_ed25519_NONREDUCEDSCALARBYTES];
 
+    memset(x_, 0, sizeof x_);
+    memset(y_, 0, sizeof y_);
     memcpy(x_, x, crypto_core_ed25519_SCALARBYTES);
     memcpy(y_, y, crypto_core_ed25519_SCALARBYTES);
     sodium_add(x_, y_, crypto_core_ed25519_SCALARBYTES);