diff --git a/windows/plink.c b/windows/plink.c
index 8b871912..30779cef 100644
--- a/windows/plink.c
+++ b/windows/plink.c
@@ -375,7 +375,7 @@ int main(int argc, char **argv)
             while (arg) {
                 if (cmdbuf->len > 0)
                     put_byte(cmdbuf, ' '); /* add space separator */
-                put_dataz(cmdbuf, cmdline_arg_to_str(arg));
+                put_dataz(cmdbuf, cmdline_arg_to_utf8(arg));
                 arg = arglist->args[arglistpos++];
             }