diff --git a/src/3rdparty/libwebp/src/dec/idec_dec.c b/src/3rdparty/libwebp/src/dec/idec_dec.c

index 78fb2e7..cf7e182 100644

--- a/src/3rdparty/libwebp/src/dec/idec_dec.c

+++ b/src/3rdparty/libwebp/src/dec/idec_dec.c

@@ -473,6 +473,12 @@ static VP8StatusCode DecodeRemaining(WebPIDecoder* const idec) {

             MemDataSize(&idec->mem_) > MAX_MB_SIZE) {

           return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR);

         }

+        // Synchronize the threads.

+        if (dec->mt_method_ > 0) {

+          if (!WebPGetWorkerInterface()->Sync(&dec->worker_)) {

+            return IDecError(idec, VP8_STATUS_BITSTREAM_ERROR);

+          }

+        }

         RestoreContext(&context, dec, token_br);

         return VP8_STATUS_SUSPENDED;

       }