diff --git a/libavcodec/8svx.c b/libavcodec/8svx.c
index f42a35b20b..e220ad13cc 100644
--- a/libavcodec/8svx.c
+++ b/libavcodec/8svx.c
@@ -47,7 +47,7 @@ typedef struct EightSvxContext {
     /* buffer used to store the whole audio decoded/interleaved chunk,
      * which is sent with the first packet */
     uint8_t *samples;
-    size_t samples_size;
+    int64_t samples_size;
     int samples_idx;
 } EightSvxContext;