diff --git a/include/ucore/rbtree.h b/include/ucore/rbtree.h
index 7c706a4..ac9fcd6 100644
--- a/include/ucore/rbtree.h
+++ b/include/ucore/rbtree.h
@@ -5,11 +5,11 @@
 extern "C" {
 #endif
 
-typedef enum RBColor RBColor;
 enum RBColor {
     Red,
     Black
 };
+typedef enum RBColor RBColor;
 
 typedef struct RBNode RBNode;
 struct RBNode {