diff --git a/src/modules/dbus/iface-card.c b/src/modules/dbus/iface-card.c
index 1b705ba7b..520325065 100644
--- a/src/modules/dbus/iface-card.c
+++ b/src/modules/dbus/iface-card.c
@@ -457,27 +457,27 @@ static void check_card_proplist(pa_dbusiface_card *c) {
 }
 
 static pa_hook_result_t card_profile_changed_cb(void *hook_data, void *call_data, void *slot_data) {
-    pa_dbusiface_card *c = slot_data;
-    pa_card_profile *profile = call_data;
+    pa_dbusiface_card *dbus_card = slot_data;
+    pa_card *core_card = call_data;
     const char *object_path;
     DBusMessage *signal_msg;
 
-    if (profile->card != c->card)
+    if (dbus_card->card != core_card)
         return PA_HOOK_OK;
 
-    c->active_profile = c->card->active_profile;
+    dbus_card->active_profile = dbus_card->card->active_profile;
 
-    object_path = pa_dbusiface_card_profile_get_path(pa_hashmap_get(c->profiles, c->active_profile->name));
+    object_path = pa_dbusiface_card_profile_get_path(pa_hashmap_get(dbus_card->profiles, dbus_card->active_profile->name));
 
-    pa_assert_se(signal_msg = dbus_message_new_signal(c->path,
+    pa_assert_se(signal_msg = dbus_message_new_signal(dbus_card->path,
                                                       PA_DBUSIFACE_CARD_INTERFACE,
                                                       signals[SIGNAL_ACTIVE_PROFILE_UPDATED].name));
     pa_assert_se(dbus_message_append_args(signal_msg, DBUS_TYPE_OBJECT_PATH, &object_path, DBUS_TYPE_INVALID));
 
-    pa_dbus_protocol_send_signal(c->dbus_protocol, signal_msg);
+    pa_dbus_protocol_send_signal(dbus_card->dbus_protocol, signal_msg);
     dbus_message_unref(signal_msg);
 
-    check_card_proplist(c);
+    check_card_proplist(dbus_card);
 
     return PA_HOOK_OK;
 }