diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index 39dfba9930a..e42631c8adc 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -2024,11 +2024,11 @@ PyAPI_FUNC(int) _PyUnicode_ToUpperFull(
     );
 
 PyAPI_FUNC(int) _PyUnicode_IsCaseIgnorable(
-    const Py_UCS4 ch         /* Unicode character */
+    Py_UCS4 ch         /* Unicode character */
     );
 
 PyAPI_FUNC(int) _PyUnicode_IsCased(
-    const Py_UCS4 ch         /* Unicode character */
+    Py_UCS4 ch         /* Unicode character */
     );
 
 PyAPI_FUNC(int) _PyUnicode_ToDecimalDigit(