1 files changed, 2 insertions, 0 deletions
diff --git a/ports/unix/main.c b/ports/unix/main.c
index 9147feb32d..fcf8b1558c 100644
--- a/ports/unix/main.c
+++ b/ports/unix/main.c
@@ -64,7 +64,9 @@ long heap_size = 1024*1024 * (sizeof(mp_uint_t) / 4);
 
 STATIC void stderr_print_strn(void *env, const char *str, size_t len) {
     (void)env;
+    MP_THREAD_GIL_EXIT();
     ssize_t dummy = write(STDERR_FILENO, str, len);
+    MP_THREAD_GIL_ENTER();
     mp_uos_dupterm_tx_strn(str, len);
     (void)dummy;
 }