diff --git a/src/libsodium/crypto_scalarmult/curve25519/ref10/x25519_ref10.c b/src/libsodium/crypto_scalarmult/curve25519/ref10/x25519_ref10.c
index 9eaf0235..d2989228 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/ref10/x25519_ref10.c
+++ b/src/libsodium/crypto_scalarmult/curve25519/ref10/x25519_ref10.c
@@ -74,7 +74,7 @@ crypto_scalarmult_curve25519_ref10(unsigned char *q,
                                    const unsigned char *n,
                                    const unsigned char *p)
 {
-    unsigned char *t = q;
+    unsigned char  t[32];
     unsigned int   i;
     fe25519        x1;
     fe25519        x2;
@@ -136,6 +136,8 @@ crypto_scalarmult_curve25519_ref10(unsigned char *q,
     fe25519_mul(x2, x2, z2);
     fe25519_tobytes(q, x2);
 
+    sodium_memzero(t, sizeof t);
+
     return 0;
 }
 
diff --git a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/curve25519_sandy2x.c b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/curve25519_sandy2x.c
index 0f8f8b13..74207591 100644
--- a/src/libsodium/crypto_scalarmult/curve25519/sandy2x/curve25519_sandy2x.c
+++ b/src/libsodium/crypto_scalarmult/curve25519/sandy2x/curve25519_sandy2x.c
@@ -24,7 +24,7 @@ static int
 crypto_scalarmult_curve25519_sandy2x(unsigned char *q, const unsigned char *n,
                                      const unsigned char *p)
 {
-  unsigned char *t = q;
+  unsigned char  t[32];
   fe             var[3];
   fe51           x_51;
   fe51           z_51;
@@ -57,6 +57,8 @@ crypto_scalarmult_curve25519_sandy2x(unsigned char *q, const unsigned char *n,
   fe51_mul(&x_51, &x_51, &z_51);
   fe51_pack(q, &x_51);
 
+  sodium_memzero(t, sizeof t);
+
   return 0;
 }