diff --git a/esp8266/main.c b/esp8266/main.c
index 033ab7afed..a2e747d211 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -39,7 +39,7 @@
 #include "gccollect.h"
 #include "user_interface.h"
 
-STATIC char heap[28 * 1024];
+STATIC char heap[36 * 1024];
 
 STATIC void mp_reset(void) {
     mp_stack_set_top((void*)0x40000000);