diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/cards/nPA.py b/virtualsmartcard/src/vpicc/virtualsmartcard/cards/nPA.py
index 45baf97..cb036cd 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/cards/nPA.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/cards/nPA.py
@@ -208,7 +208,7 @@ class nPA_SE(Security_Environment):
             ef_card_security_data = ef_card_security.data
             pace.CA_disable_passive_authentication(self.eac_ctx)
             ca_pubkey = pace.CA_get_pubkey(self.eac_ctx, ef_card_security_data)
-            pace.EAC_CTX_init_ca(self.eac_ctx, 0, 0, self.ca_key, ca_pubkey)
+            pace.EAC_CTX_init_ca(self.eac_ctx, pace.id_CA_ECDH_AES_CBC_CMAC_128, 13, self.ca_key, ca_pubkey)
 
             if not self.ca_key:
                 # we don't have a good CA key, so we simply generate an ephemeral one