diff --git a/src/storage/storage_backend_gluster.c b/src/storage/storage_backend_gluster.c
index cab23b06f5..1a2b4ec5a3 100644
--- a/src/storage/storage_backend_gluster.c
+++ b/src/storage/storage_backend_gluster.c
@@ -173,7 +173,7 @@ virStorageBackendGlusterReadHeader(glfs_fd_t *fd,
         }
         if (r == 0)
             return nread;
-        buf += r;
+        s += r;
         maxlen -= r;
         nread += r;
     }