diff --git a/src/afs/afs.h b/src/afs/afs.h
index 27d7645af4..813bbac69a 100644
--- a/src/afs/afs.h
+++ b/src/afs/afs.h
@@ -1381,7 +1381,7 @@ struct storeOps {
 };
 
 struct fetchOps {
-    int (*more)(void *rock, afs_uint32 *length, afs_uint32 *moredata);
+    int (*more)(void *rock, afs_int32 *length, afs_uint32 *moredata);
     int (*read)(void *rock, afs_uint32 tlen, afs_uint32 *bytesread);
     int (*write)(void *rock, struct osi_file *fp, afs_uint32 offset,
         afs_uint32 tlen, afs_uint32 *byteswritten);