diff --git a/Modules/_io/winconsoleio.c b/Modules/_io/winconsoleio.c
index 814462f..d51df7e 100644
--- a/Modules/_io/winconsoleio.c
+++ b/Modules/_io/winconsoleio.c
@@ -1000,7 +1000,7 @@
     wlen = MultiByteToWideChar(CP_UTF8, 0, b->buf, len, wbuf, wlen);
     if (wlen) {
         res = WriteConsoleW(self->handle, wbuf, wlen, &n, NULL);
-        if (n < wlen) {
+        if (res && n < wlen) {
             /* Wrote fewer characters than expected, which means our
              * len value may be wrong. So recalculate it from the
              * characters that were written. As this could potentially