diff --git a/src/openvpn/auth_token.c b/src/openvpn/auth_token.c
index 1edc8069..6275299d 100644
--- a/src/openvpn/auth_token.c
+++ b/src/openvpn/auth_token.c
@@ -31,7 +31,7 @@ const char *auth_token_pem_name = "OpenVPN auth-token server key";
 static struct key_type
 auth_token_kt(void)
 {
-    struct key_type kt;
+    struct key_type kt = { 0 };
     /* We do not encrypt our session tokens */
     kt.cipher = NULL;
     kt.digest = md_kt_get("SHA256");