diff --git a/src/openvpn/ssl.c b/src/openvpn/ssl.c
index 086a6fc..eef8e7d 100644
--- a/src/openvpn/ssl.c
+++ b/src/openvpn/ssl.c
@@ -934,6 +934,10 @@
 
     free(ks->rec_ack);
     free(ks->lru_acks);
+    if (ks->key_src)
+    {
+        secure_memzero(ks->key_src, sizeof(*ks->key_src));
+    }
     free(ks->key_src);
 
     packet_id_free(&ks->crypto_options.packet_id);