diff --git a/crypto/curve25519/curve25519.c b/crypto/curve25519/curve25519.c
index 556b455..1dd1b3e 100644
--- a/crypto/curve25519/curve25519.c
+++ b/crypto/curve25519/curve25519.c
@@ -3606,6 +3606,7 @@
 
     unsigned j;
     ge_cached selected;
+    ge_cached_0(&selected);
     for (j = 0; j < 16; j++) {
       cmov_cached(&selected, &Ai[j], equal(j, index));
     }