diff --git a/src/wrapper.c b/src/wrapper.c
index 485f1453..6f57ae8f 100644
--- a/src/wrapper.c
+++ b/src/wrapper.c
@@ -158,7 +158,7 @@ void crypto_free(struct ssh_crypto_struct *crypto){
       SAFE_FREE(crypto->kex_methods[i]);
   }
 
-  memset(crypto,0,sizeof(*crypto));
+  BURN_BUFFER(crypto, sizeof(struct ssh_crypto_struct));
 
   SAFE_FREE(crypto);
 }