diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 506b8fdb5f1b6..4b0575b60a112 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -503,8 +503,7 @@ static inline unsigned int mte_parent_slot(const struct maple_enode *enode)
 {
 	unsigned long val = (unsigned long)mte_to_node(enode)->parent;
 
-	/* Root. */
-	if (val & 1)
+	if (val & MA_ROOT_PARENT)
 		return 0;
 
 	/*