diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index 085c1b5261..4279ef9ef9 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -577,10 +577,10 @@ static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int
         last[0] = (int)((unsigned)last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
     last[2] = (int)((unsigned)last[1] + last[3]) >> 1;
 
-    t1 = ctx->D[0] + ctx->D[1];
+    t1 = ctx->D[0] + (unsigned)ctx->D[1];
     ctx->D[0] = t1 >> 1;
     ctx->D[1] = t1 - (t1 >> 1);
-    t2 = ctx->D[2] + ctx->D[3];
+    t2 = ctx->D[2] + (unsigned)ctx->D[3];
     ctx->D[2] = t2 >> 1;
     ctx->D[3] = t2 - (t2 >> 1);