diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index d7149e51b7..e93f44e2e0 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -497,7 +497,7 @@ static void parcor_to_lpc(unsigned int k, const int32_t *par, int32_t *cof)
     int i, j;
 
     for (i = 0, j = k - 1; i < j; i++, j--) {
-        int tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
+        unsigned tmp1 = ((MUL64(par[k], cof[j]) + (1 << 19)) >> 20);
         cof[j]  += ((MUL64(par[k], cof[i]) + (1 << 19)) >> 20);
         cof[i]  += tmp1;
     }
@@ -978,7 +978,7 @@ static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
         y = 1 << 19;
 
         for (sb = -opt_order; sb < 0; sb++)
-            y += MUL64(lpc_cof[sb], raw_samples[sb]);
+            y += (uint64_t)MUL64(lpc_cof[sb], raw_samples[sb]);
 
         *raw_samples -= y >> 20;
     }