diff --git a/tools/gencert/v3.ext b/tools/gencert/v3.ext
index 81058b4..d54db90 100644
--- a/tools/gencert/v3.ext
+++ b/tools/gencert/v3.ext
@@ -1,3 +1,4 @@
+subjectKeyIdentifier=hash
 authorityKeyIdentifier=keyid,issuer
 basicConstraints=CA:FALSE
 keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment