diff --git a/libavcodec/bonk.c b/libavcodec/bonk.c
index fbea91c750..6cd6a0af61 100644
--- a/libavcodec/bonk.c
+++ b/libavcodec/bonk.c
@@ -277,7 +277,7 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
     for (i = order-2; i >= 0; i--, k_ptr--, state_ptr--) {
         unsigned k_value = *k_ptr, state_value = *state_ptr;
 
-        x -= shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
+        x -= (unsigned) shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
         state_ptr[1] = state_value + shift_down(k_value * x, LATTICE_SHIFT);
     }