diff --git a/libavcodec/dirac_dwt.h b/libavcodec/dirac_dwt.h
index 4d338651fae2ad02537bd196d095e93f8267a3a6..62f8472b41bdd704a854968fda0e354e4a1292cc 100644
--- a/libavcodec/dirac_dwt.h
+++ b/libavcodec/dirac_dwt.h
@@ -99,7 +99,7 @@ void ff_spatial_idwt_slice2(DWTContext *d, int y);
     (b1 + ((b0 + b2 + 1) >> 1))
 
 #define COMPOSE_DD97iH0(b0, b1, b2, b3, b4)\
-    (b2 + ((-b0 + 9*b1 + 9*b3 - b4 + 8) >> 4))
+    (b2 + ((int)(-b0 + 9U*b1 + 9U*b3 - b4 + 8) >> 4))
 
 #define COMPOSE_DD137iL0(b0, b1, b2, b3, b4)\
     (b2 - ((-b0 + 9*b1 + 9*b3 - b4 + 16) >> 5))