diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index b8e4b3dc81..26c496c769 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -918,7 +918,7 @@ static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
             y = 1 << 6;
 
             for (base = begin; base < end; base++, tab++)
-                y += MUL64(bd->ltp_gain[tab], raw_samples[base]);
+                y += (uint64_t)MUL64(bd->ltp_gain[tab], raw_samples[base]);
 
             raw_samples[ltp_smp] += y >> 7;
         }
@@ -930,7 +930,7 @@ static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
             y = 1 << 19;
 
             for (sb = 0; sb < smp; sb++)
-                y += MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
+                y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[-(sb + 1)]);
 
             *raw_samples++ -= y >> 20;
             parcor_to_lpc(smp, quant_cof, lpc_cof);