1 files changed, 7 insertions, 2 deletions
diff --git a/ports/unix/unix_mphal.c b/ports/unix/unix_mphal.c
index 8d6539c88..24c0fa3cd 100644
--- a/ports/unix/unix_mphal.c
+++ b/ports/unix/unix_mphal.c
@@ -184,10 +184,15 @@ main_term:;
     return c;
 }
 
-void mp_hal_stdout_tx_strn(const char *str, size_t len) {
+mp_uint_t mp_hal_stdout_tx_strn(const char *str, size_t len) {
     ssize_t ret;
     MP_HAL_RETRY_SYSCALL(ret, write(STDOUT_FILENO, str, len), {});
-    mp_os_dupterm_tx_strn(str, len);
+    mp_uint_t written = ret < 0 ? 0 : ret;
+    int dupterm_res = mp_os_dupterm_tx_strn(str, len);
+    if (dupterm_res >= 0) {
+        written = MIN((mp_uint_t)dupterm_res, written);
+    }
+    return written;
 }
 
 // cooked is same as uncooked because the terminal does some postprocessing