diff --git a/src/eap_peer/eap_proxy.h b/src/eap_peer/eap_proxy.h
index 23cdbe698..7205fad44 100644
--- a/src/eap_peer/eap_proxy.h
+++ b/src/eap_peer/eap_proxy.h
@@ -20,7 +20,7 @@ enum eap_proxy_status {
 };
 
 struct eap_proxy_sm *
-eap_proxy_init(void *eapol_ctx, struct eapol_callbacks *eapol_cb,
+eap_proxy_init(void *eapol_ctx, const struct eapol_callbacks *eapol_cb,
 	       void *msg_ctx);
 
 void eap_proxy_deinit(struct eap_proxy_sm *eap_proxy);
diff --git a/src/eap_peer/eap_proxy_dummy.c b/src/eap_peer/eap_proxy_dummy.c
index d84f01234..08009cab2 100644
--- a/src/eap_peer/eap_proxy_dummy.c
+++ b/src/eap_peer/eap_proxy_dummy.c
@@ -12,7 +12,7 @@
 #include "eap_proxy.h"
 
 struct eap_proxy_sm *
-eap_proxy_init(void *eapol_ctx, struct eapol_callbacks *eapol_cb,
+eap_proxy_init(void *eapol_ctx, const struct eapol_callbacks *eapol_cb,
 	       void *msg_ctx)
 {
 	return NULL;