diff --git a/native/jni/src/defines.h b/native/jni/src/defines.h
index 2fe2bd8fa..761063f8a 100644
--- a/native/jni/src/defines.h
+++ b/native/jni/src/defines.h
@@ -325,6 +325,8 @@ static inline void prof_out(void) {
 #define KEYCODE_SPACE ' '
 #define KEYCODE_SINGLE_QUOTE '\''
 #define KEYCODE_HYPHEN_MINUS '-'
+// Code point to indicate beginning-of-sentence. This is not in the code point space of unicode.
+#define CODE_POINT_BEGINNING_OF_SENTENCE 0x110000
 
 #define SUGGEST_INTERFACE_OUTPUT_SCALE 1000000.0f
 #define MAX_PROBABILITY 255