diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 7605267244..5c68463f18 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -956,7 +956,7 @@ static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
 
         // reconstruct difference signal for prediction (joint-stereo)
         if (bd->js_blocks && bd->raw_other) {
-            int32_t *left, *right;
+            uint32_t *left, *right;
 
             if (bd->raw_other > raw_samples) {  // D = R - L
                 left  = raw_samples;