diff --git a/cores/esp8266/umm_malloc/umm_malloc_cfg.h b/cores/esp8266/umm_malloc/umm_malloc_cfg.h
index 632480024..3d38d2b0e 100644
--- a/cores/esp8266/umm_malloc/umm_malloc_cfg.h
+++ b/cores/esp8266/umm_malloc/umm_malloc_cfg.h
@@ -6,8 +6,6 @@
 #define _UMM_MALLOC_CFG_H
 
 #include <debug.h>
-#include <ets_sys.h>
-#define printf ets_printf
 /*
  * There are a number of defines you can set at compile time that affect how
  * the memory allocator will operate.