diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index 2926c35..233f8e0 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -866,13 +866,16 @@
     { 0,    0,     "H"  }
 };
 
+/* These ranges need to match makeunicodedata.py:cjk_ranges. */
 static int
 is_unified_ideograph(Py_UCS4 code)
 {
-    return (
-        (0x3400 <= code && code <= 0x4DB5) || /* CJK Ideograph Extension A */
-        (0x4E00 <= code && code <= 0x9FBB) || /* CJK Ideograph */
-        (0x20000 <= code && code <= 0x2A6D6));/* CJK Ideograph Extension B */
+    return
+        (0x3400 <= code && code <= 0x4DB5)   || /* CJK Ideograph Extension A */
+        (0x4E00 <= code && code <= 0x9FCB)   || /* CJK Ideograph */
+        (0x20000 <= code && code <= 0x2A6D6) || /* CJK Ideograph Extension B */
+        (0x2A700 <= code && code <= 0x2B734) || /* CJK Ideograph Extension C */
+        (0x2B740 <= code && code <= 0x2B81D);   /* CJK Ideograph Extension D */
 }
 
 static int