diff --git a/src/win/win_serial_passthrough.c b/src/win/win_serial_passthrough.c
index 78ed1a766..cfe920aa7 100644
--- a/src/win/win_serial_passthrough.c
+++ b/src/win/win_serial_passthrough.c
@@ -166,7 +166,8 @@ static int
 open_pseudo_terminal(serial_passthrough_t *dev)
 {
     char ascii_pipe_name[1024] = { 0 };
-    strncpy(ascii_pipe_name, dev->named_pipe, 1023);
+    strncpy(ascii_pipe_name, dev->named_pipe, sizeof(ascii_pipe_name));
+    ascii_pipe_name[1023] = '\0';
     dev->master_fd = (intptr_t) CreateNamedPipeA(ascii_pipe_name, PIPE_ACCESS_DUPLEX, PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_NOWAIT, 1, 65536, 65536, NMPWAIT_USE_DEFAULT_WAIT, NULL);
     if (dev->master_fd == (intptr_t) INVALID_HANDLE_VALUE) {
         wchar_t errorMsg[1024] = { 0 };