diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 1ab76b5278283052a6574a0637078edaafeb222f..553e5c884d0eee44a3f09a067d77938c912a2aa7 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -40,6 +40,10 @@ static void free_buffers(VP8Context *s)
     int i;
     if (s->thread_data)
         for (i = 0; i < MAX_THREADS; i++) {
+#if HAVE_THREADS
+            pthread_cond_destroy(&s->thread_data[i].cond);
+            pthread_mutex_destroy(&s->thread_data[i].lock);
+#endif
             av_freep(&s->thread_data[i].filter_strength);
             av_freep(&s->thread_data[i].edge_emu_buffer);
         }