diff --git a/Objects/stringlib/eq.h b/Objects/stringlib/eq.h
index dd67128..8e79a43 100644
--- a/Objects/stringlib/eq.h
+++ b/Objects/stringlib/eq.h
@@ -30,5 +30,5 @@
         PyUnicode_GET_LENGTH(a) == 1)
         return 1;
     return memcmp(PyUnicode_1BYTE_DATA(a), PyUnicode_1BYTE_DATA(b),
-                  PyUnicode_GET_LENGTH(a) * PyUnicode_CHARACTER_SIZE(a)) == 0;
+                  PyUnicode_GET_LENGTH(a) * PyUnicode_KIND(a)) == 0;
 }