diff --git a/lib/libdvbsub/dvbsub.cpp b/lib/libdvbsub/dvbsub.cpp
index d9c8c9d04..b573a31b5 100644
--- a/lib/libdvbsub/dvbsub.cpp
+++ b/lib/libdvbsub/dvbsub.cpp
@@ -174,7 +174,7 @@ int dvbsub_close()
 		pthread_mutex_unlock(&readerMutex);
 
 		pthread_join(threadReader, NULL);
-		threadReader = NULL;
+		threadReader = 0;
 	}
 	if(threadDvbsub) {
 		dvbsub_running = false;
@@ -184,7 +184,7 @@ int dvbsub_close()
 		pthread_mutex_unlock(&packetMutex);
 
 		pthread_join(threadDvbsub, NULL);
-		threadDvbsub = NULL;
+		threadDvbsub = 0;
 	}
 	printf("[dvb-sub] stopped\n");
 
diff --git a/lib/libtuxtxt/tuxtxt.cpp b/lib/libtuxtxt/tuxtxt.cpp
index 7b6dd280d..c568cebc4 100644
--- a/lib/libtuxtxt/tuxtxt.cpp
+++ b/lib/libtuxtxt/tuxtxt.cpp
@@ -1548,7 +1548,7 @@ void tuxtx_stop_subtitle()
 	reader_running = 0;
 	if(ttx_sub_thread)
 		pthread_join(ttx_sub_thread, NULL);
-	ttx_sub_thread = NULL;
+	ttx_sub_thread = 0;
 	sub_pid = sub_page = 0;
 	ttx_paused = 0;
 }