diff --git a/libavcodec/cook.c b/libavcodec/cook.c
index 99d1bdb8c6..df85c7d431 100644
--- a/libavcodec/cook.c
+++ b/libavcodec/cook.c
@@ -72,7 +72,7 @@ typedef struct {
 
 typedef struct {
     int                 ch_idx;
-    int                 size;
+    unsigned int        size;
     int                 num_channels;
     int                 cookversion;
     int                 samples_per_frame;