diff --git a/esp8266/mpconfigport.h b/esp8266/mpconfigport.h
index 5aea7b7aee..2197bd06f4 100644
--- a/esp8266/mpconfigport.h
+++ b/esp8266/mpconfigport.h
@@ -54,6 +54,7 @@
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_FLOAT)
 #define MICROPY_ERROR_REPORTING     (MICROPY_ERROR_REPORTING_TERSE)
+#define MICROPY_STREAMS_NON_BLOCK   (1)
 #define MICROPY_MODULE_FROZEN       (1)
 #define MICROPY_MODULE_FROZEN_LEXER mp_lexer_new_from_str32