diff --git a/Tools/perfecthash/GenUCNHash.py b/Tools/perfecthash/GenUCNHash.py
index 31a0590..0701c25 100644
--- a/Tools/perfecthash/GenUCNHash.py
+++ b/Tools/perfecthash/GenUCNHash.py
@@ -38,7 +38,7 @@
 typedef struct 
 {
     const char *pszUCN;
-    unsigned int uiValue;
+    Py_UCS4 value;
 } _Py_UnicodeCharacterName;
 
 """