diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index 18719dae1c..100880c257 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -837,7 +837,7 @@ static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
     dst = p->data[0];
     for (j = 0; j < h; j++) {
         for (i = 0; i < w; i++) {
-            int y = Y[i], u = U[i >> 1], v = V[i >> 1];
+            unsigned y = Y[i], u = U[i >> 1], v = V[i >> 1];
             dst[3*i+0] = av_clip_uint8(y + v);
             dst[3*i+1] = av_clip_uint8(y);
             dst[3*i+2] = av_clip_uint8(y + u);