diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 8bfbb75b41..d31c067152 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1284,7 +1284,7 @@ static void predictor_decode_stereo_3950(APEContext *ctx, int count)
             *decoded1++ = a1;
             if (num_passes > 1) {
                 int32_t left  = a1 - (unsigned)(a0 / 2);
-                int32_t right = left + a0;
+                int32_t right = left + (unsigned)a0;
 
                 if (FFMAX(FFABS(left), FFABS(right)) > (1<<23)) {
                     ctx->interim_mode = !interim_mode;