diff --git a/Python/formatter_unicode.c b/Python/formatter_unicode.c
index 0378800..fda79fc 100644
--- a/Python/formatter_unicode.c
+++ b/Python/formatter_unicode.c
@@ -693,7 +693,7 @@
     Py_ssize_t rpad;
     Py_ssize_t total;
     Py_ssize_t pos;
-    Py_ssize_t len = PyUnicode_GET_SIZE(value);
+    Py_ssize_t len = PyUnicode_GET_LENGTH(value);
     PyObject *result = NULL;
     int maxchar = 127;