diff --git a/src/mm-port-probe-at.c b/src/mm-port-probe-at.c
index 4505fc76..c9832b6c 100644
--- a/src/mm-port-probe-at.c
+++ b/src/mm-port-probe-at.c
@@ -47,7 +47,10 @@ mm_port_probe_response_processor_is_at (const gchar *command,
                              MM_SERIAL_ERROR_RESPONSE_TIMEOUT) ||
             g_error_matches (error,
                              MM_SERIAL_ERROR,
-                             MM_SERIAL_ERROR_SEND_FAILED)) {
+                             MM_SERIAL_ERROR_SEND_FAILED) ||
+            g_error_matches (error,
+                             MM_SERIAL_ERROR,
+                             MM_SERIAL_ERROR_SEND_TIMEOUT)) {
             return FALSE;
         }