diff --git a/src/os_mswin.c b/src/os_mswin.c
index 6d04326..998d27b 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -919,7 +919,7 @@
     while (todo > 0)
     {
 	/* Only convert if we have a complete sequence. */
-	l = utf_ptr2len_check_len(p, todo);
+	l = utf_ptr2len_len(p, todo);
 	if (l > todo)
 	{
 	    /* Return length of incomplete sequence. */