1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/vp8.h b/libavcodec/vp8.h
index 3910b5c0dd..d7e7680276 100644
--- a/libavcodec/vp8.h
+++ b/libavcodec/vp8.h
@@ -26,6 +26,8 @@
 #ifndef AVCODEC_VP8_H
 #define AVCODEC_VP8_H
 
+#include <stdatomic.h>
+
 #include "libavutil/buffer.h"
 #include "libavutil/thread.h"
 
@@ -114,8 +116,8 @@ typedef struct VP8ThreadData {
     pthread_mutex_t lock;
     pthread_cond_t cond;
 #endif
-    int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
-    int wait_mb_pos; // What the current thread is waiting on.
+    atomic_int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
+    atomic_int wait_mb_pos; // What the current thread is waiting on.
 
 #define EDGE_EMU_LINESIZE 32
     DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE];