--- a/configmix/_speedups.c	Thu Jan 06 20:37:29 2022 +0100
+++ b/configmix/_speedups.c	Thu Jan 06 22:36:37 2022 +0100
@@ -145,10 +145,11 @@
 Py_ssize_t
 _convert_ucs4_to_utf8(
     Py_UCS4 ch,
+    unsigned char *targetStart, unsigned char *targetEnd,
+    int strict,
     PyObject *ch_obj,  /* for error messages: the string where ch comes from */
-    Py_ssize_t ch_obj_end,  /* effective length of ch_obj (error reporting) */
-    unsigned char *targetStart, unsigned char *targetEnd,
-    int strict)
+    Py_ssize_t ch_obj_end  /* effective length of ch_obj (error reporting) */
+    )
 {
     const Py_UCS4 byteMask = 0xBF;
     const Py_UCS4 byteMark = 0x80;
@@ -222,7 +223,7 @@
         return NULL;
 
     /* Replace the combination PyUniode_New/PyUnicode_WriteChar */
-    bytes_written = _convert_ucs4_to_utf8(c, s, end+1, buf, &(buf[6]), 1);
+    bytes_written = _convert_ucs4_to_utf8(c, buf, &(buf[6]), 1, s, end+1);
     if (bytes_written < 0) {
         return NULL;
     }