diff --git a/lib/bootconfig.c b/lib/bootconfig.c
index 8c50e942d747..94ae6662531d 100644
--- a/lib/bootconfig.c
+++ b/lib/bootconfig.c
@@ -183,7 +183,7 @@ struct xbc_node * __init xbc_node_get_next(struct xbc_node *node)
  */
 const char * __init xbc_node_get_data(struct xbc_node *node)
 {
-	int offset = node->data & ~XBC_VALUE;
+	size_t offset = node->data & ~XBC_VALUE;
 
 	if (WARN_ON(offset >= xbc_data_size))
 		return NULL;