diff --git a/src/rime/gear/charset_filter.cc b/src/rime/gear/charset_filter.cc
index 2f14f9e5f..6bd729fe5 100644
--- a/src/rime/gear/charset_filter.cc
+++ b/src/rime/gear/charset_filter.cc
@@ -23,6 +23,7 @@ bool is_extended_cjk(uint32_t ch)
       (ch >= 0x2A700 && ch <= 0x2B73F) ||  // CJK Unified Ideographs Extension C
       (ch >= 0x2B740 && ch <= 0x2B81F) ||  // CJK Unified Ideographs Extension D
       (ch >= 0x2B820 && ch <= 0x2CEAF) ||  // CJK Unified Ideographs Extension E
+      (ch >= 0x2CEB0 && ch <= 0x2EBEF) ||  // CJK Unified Ideographs Extension F
       (ch >= 0x2F800 && ch <= 0x2FA1F))    // CJK Compatibility Ideographs Supplement
     return true;