diff --git a/src/wps/upnp_xml.c b/src/wps/upnp_xml.c
index a9958ee..ca0925c 100644
--- a/src/wps/upnp_xml.c
+++ b/src/wps/upnp_xml.c
@@ -235,7 +235,7 @@
 		return NULL;
 	}
 
-	decoded = base64_decode((unsigned char *) msg, os_strlen(msg), &len);
+	decoded = base64_decode(msg, os_strlen(msg), &len);
 	os_free(msg);
 	if (decoded == NULL) {
 		*ret = UPNP_OUT_OF_MEMORY;
diff --git a/src/wps/wps_er.c b/src/wps/wps_er.c
index 06a8fda..6bded14 100644
--- a/src/wps/wps_er.c
+++ b/src/wps/wps_er.c
@@ -897,7 +897,7 @@
 				       const struct sockaddr_in *dst,
 				       char **len_ptr, char **body_ptr)
 {
-	unsigned char *encoded;
+	char *encoded;
 	size_t encoded_len;
 	struct wpabuf *buf;
 
@@ -939,7 +939,7 @@
 	wpabuf_put_str(buf, "\">\n");
 	if (encoded) {
 		wpabuf_printf(buf, "<%s>%s</%s>\n",
-			      arg_name, (char *) encoded, arg_name);
+			      arg_name, encoded, arg_name);
 		os_free(encoded);
 	}
 
diff --git a/src/wps/wps_registrar.c b/src/wps/wps_registrar.c
index 0ac5b28..671f5fe 100644
--- a/src/wps/wps_registrar.c
+++ b/src/wps/wps_registrar.c
@@ -1745,7 +1745,8 @@
 			return -1;
 		}
 		os_free(wps->new_psk);
-		wps->new_psk = base64_encode(r, sizeof(r), &wps->new_psk_len);
+		wps->new_psk = (u8 *) base64_encode(r, sizeof(r),
+						    &wps->new_psk_len);
 		if (wps->new_psk == NULL)
 			return -1;
 		wps->new_psk_len--; /* remove newline */
diff --git a/src/wps/wps_upnp.c b/src/wps/wps_upnp.c
index ca893a4..6e10e4b 100644
--- a/src/wps/wps_upnp.c
+++ b/src/wps/wps_upnp.c
@@ -519,8 +519,9 @@
 
 	dl_list_for_each_safe(s, tmp, &sm->subscriptions, struct subscription,
 			      list) {
-		event_add(s, buf,
-			  sm->wlanevent_type == UPNP_WPS_WLANEVENT_TYPE_PROBE);
+		wps_upnp_event_add(
+			s, buf,
+			sm->wlanevent_type == UPNP_WPS_WLANEVENT_TYPE_PROBE);
 	}
 
 	wpabuf_free(buf);
@@ -541,7 +542,7 @@
 	struct upnp_wps_device_interface *iface;
 	wpa_printf(MSG_DEBUG, "WPS UPnP: Destroy subscription %p", s);
 	subscr_addr_free_all(s);
-	event_delete_all(s);
+	wps_upnp_event_delete_all(s);
 	dl_list_for_each(iface, &s->sm->interfaces,
 			 struct upnp_wps_device_interface, list)
 		upnp_er_remove_notification(iface->wps->registrar, s);
@@ -647,7 +648,7 @@
 			   "initial WLANEvent");
 		msg = build_fake_wsc_ack();
 		if (msg) {
-			s->sm->wlanevent = (char *)
+			s->sm->wlanevent =
 				base64_encode(wpabuf_head(msg),
 					      wpabuf_len(msg), NULL);
 			wpabuf_free(msg);
@@ -672,7 +673,7 @@
 		wpabuf_put_property(buf, "WLANEvent", wlan_event);
 	wpabuf_put_str(buf, tail);
 
-	ret = event_add(s, buf, 0);
+	ret = wps_upnp_event_add(s, buf, 0);
 	if (ret) {
 		wpabuf_free(buf);
 		return ret;
@@ -749,7 +750,7 @@
 		   "WPS UPnP: Subscription %p (SID %s) started with %s",
 		   s, str, callback_urls);
 	/* Schedule sending this */
-	event_send_all_later(sm);
+	wps_upnp_event_send_all_later(sm);
 	return s;
 }
 
@@ -822,7 +823,7 @@
 	}
 	raw_len = pos;
 
-	val = (char *) base64_encode(raw, raw_len, &val_len);
+	val = base64_encode(raw, raw_len, &val_len);
 	if (val == NULL)
 		goto fail;
 
@@ -987,7 +988,7 @@
 
 	advertisement_state_machine_stop(sm, 1);
 
-	event_send_stop_all(sm);
+	wps_upnp_event_send_stop_all(sm);
 	os_free(sm->wlanevent);
 	sm->wlanevent = NULL;
 	os_free(sm->ip_addr_text);
diff --git a/src/wps/wps_upnp_event.c b/src/wps/wps_upnp_event.c
index 94aae75..d7e6edc 100644
--- a/src/wps/wps_upnp_event.c
+++ b/src/wps/wps_upnp_event.c
@@ -96,8 +96,8 @@
 }
 
 
-/* event_delete_all -- delete entire event queue and current event */
-void event_delete_all(struct subscription *s)
+/* wps_upnp_event_delete_all -- delete entire event queue and current event */
+void wps_upnp_event_delete_all(struct subscription *s)
 {
 	struct wps_event_ *e;
 	while ((e = event_dequeue(s)) != NULL)
@@ -134,11 +134,11 @@
 		event_delete(e);
 		s->last_event_failed = 1;
 		if (!dl_list_empty(&s->event_queue))
-			event_send_all_later(s->sm);
+			wps_upnp_event_send_all_later(s->sm);
 		return;
 	}
 	dl_list_add(&s->event_queue, &e->list);
-	event_send_all_later(sm);
+	wps_upnp_event_send_all_later(sm);
 }
 
 
@@ -228,7 +228,7 @@
 
 		/* Schedule sending more if there is more to send */
 		if (!dl_list_empty(&s->event_queue))
-			event_send_all_later(s->sm);
+			wps_upnp_event_send_all_later(s->sm);
 		break;
 	case HTTP_CLIENT_FAILED:
 		wpa_printf(MSG_DEBUG, "WPS UPnP: Event send failure");
@@ -328,19 +328,19 @@
 
 	if (nerrors) {
 		/* Try again later */
-		event_send_all_later(sm);
+		wps_upnp_event_send_all_later(sm);
 	}
 }
 
 
-/* event_send_all_later -- schedule sending events to all subscribers
+/* wps_upnp_event_send_all_later -- schedule sending events to all subscribers
  * that need it.
  * This avoids two problems:
  * -- After getting a subscription, we should not send the first event
  *      until after our reply is fully queued to be sent back,
  * -- Possible stack depth or infinite recursion issues.
  */
-void event_send_all_later(struct upnp_wps_device_sm *sm)
+void wps_upnp_event_send_all_later(struct upnp_wps_device_sm *sm)
 {
 	/*
 	 * The exact time in the future isn't too important. Waiting a bit
@@ -354,8 +354,8 @@
 }
 
 
-/* event_send_stop_all -- cleanup */
-void event_send_stop_all(struct upnp_wps_device_sm *sm)
+/* wps_upnp_event_send_stop_all -- cleanup */
+void wps_upnp_event_send_stop_all(struct upnp_wps_device_sm *sm)
 {
 	if (sm->event_send_all_queued)
 		eloop_cancel_timeout(event_send_all_later_handler, NULL, sm);
@@ -364,13 +364,14 @@
 
 
 /**
- * event_add - Add a new event to a queue
+ * wps_upnp_event_add - Add a new event to a queue
  * @s: Subscription
  * @data: Event data (is copied; caller retains ownership)
  * @probereq: Whether this is a Probe Request event
  * Returns: 0 on success, -1 on error, 1 on max event queue limit reached
  */
-int event_add(struct subscription *s, const struct wpabuf *data, int probereq)
+int wps_upnp_event_add(struct subscription *s, const struct wpabuf *data,
+		       int probereq)
 {
 	struct wps_event_ *e;
 	unsigned int len;
@@ -416,6 +417,6 @@
 	wpa_printf(MSG_DEBUG, "WPS UPnP: Queue event %p for subscriber %p "
 		   "(queue len %u)", e, s, len + 1);
 	dl_list_add_tail(&s->event_queue, &e->list);
-	event_send_all_later(s->sm);
+	wps_upnp_event_send_all_later(s->sm);
 	return 0;
 }
diff --git a/src/wps/wps_upnp_i.h b/src/wps/wps_upnp_i.h
index 6a7c627..e87a932 100644
--- a/src/wps/wps_upnp_i.h
+++ b/src/wps/wps_upnp_i.h
@@ -177,10 +177,11 @@
 void web_listener_stop(struct upnp_wps_device_sm *sm);
 
 /* wps_upnp_event.c */
-int event_add(struct subscription *s, const struct wpabuf *data, int probereq);
-void event_delete_all(struct subscription *s);
-void event_send_all_later(struct upnp_wps_device_sm *sm);
-void event_send_stop_all(struct upnp_wps_device_sm *sm);
+int wps_upnp_event_add(struct subscription *s, const struct wpabuf *data,
+		       int probereq);
+void wps_upnp_event_delete_all(struct subscription *s);
+void wps_upnp_event_send_all_later(struct upnp_wps_device_sm *sm);
+void wps_upnp_event_send_stop_all(struct upnp_wps_device_sm *sm);
 
 /* wps_upnp_ap.c */
 int upnp_er_set_selected_registrar(struct wps_registrar *reg,
diff --git a/src/wps/wps_upnp_web.c b/src/wps/wps_upnp_web.c
index 7548e84..3c5a97c 100644
--- a/src/wps/wps_upnp_web.c
+++ b/src/wps/wps_upnp_web.c
@@ -765,8 +765,8 @@
 
 	if (reply) {
 		size_t len;
-		replydata = (char *) base64_encode(wpabuf_head(reply),
-						   wpabuf_len(reply), &len);
+		replydata = base64_encode(wpabuf_head(reply), wpabuf_len(reply),
+					  &len);
 	} else
 		replydata = NULL;