diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 8d6cbe1ef9..dbba5687f2 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -2259,8 +2259,8 @@ static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
         }                                                                     \
     } while (0)
 #else
-#define check_thread_pos(td, otd, mb_x_check, mb_y_check)
-#define update_pos(td, mb_y, mb_x)
+#define check_thread_pos(td, otd, mb_x_check, mb_y_check) while(0)
+#define update_pos(td, mb_y, mb_x) while(0)
 #endif
 
 static av_always_inline void decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,