diff --git a/libs/network/esp8266/jswrap_esp8266_network.c b/libs/network/esp8266/jswrap_esp8266_network.c
index 30094c4b6..57d05cd3e 100644
--- a/libs/network/esp8266/jswrap_esp8266_network.c
+++ b/libs/network/esp8266/jswrap_esp8266_network.c
@@ -44,7 +44,7 @@
 #include <c_types.h>
 #include <user_interface.h>
 #include <mem.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <ping.h>
 #include <espconn.h>
 #include <sntp.h>
diff --git a/libs/network/esp8266/network_esp8266.c b/libs/network/esp8266/network_esp8266.c
index 7878db67b..39e6c78d3 100644
--- a/libs/network/esp8266/network_esp8266.c
+++ b/libs/network/esp8266/network_esp8266.c
@@ -19,7 +19,7 @@
 #include <c_types.h>
 #include <user_interface.h>
 #include <mem.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <espconn.h>
 #include <espmissingincludes.h>
 
diff --git a/libs/network/esp8266/ota.c b/libs/network/esp8266/ota.c
index 0059b6377..2598543e7 100644
--- a/libs/network/esp8266/ota.c
+++ b/libs/network/esp8266/ota.c
@@ -4,7 +4,7 @@
 #include <c_types.h>
 #include <user_interface.h>
 #include <mem.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <upgrade.h>
 #include <espconn.h>
 #include <espmissingincludes.h>
diff --git a/libs/network/esp8266/pktbuf.c b/libs/network/esp8266/pktbuf.c
index 4958b90f9..5368893b2 100644
--- a/libs/network/esp8266/pktbuf.c
+++ b/libs/network/esp8266/pktbuf.c
@@ -3,7 +3,7 @@
 #include <c_types.h>
 #include <user_interface.h>
 #include <mem.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <espmissingincludes.h>
 #include "pktbuf.h"
 
diff --git a/targets/esp8266/esp8266_board_utils.c b/targets/esp8266/esp8266_board_utils.c
index 6f2448e5a..7006193c8 100644
--- a/targets/esp8266/esp8266_board_utils.c
+++ b/targets/esp8266/esp8266_board_utils.c
@@ -14,7 +14,7 @@
  * ----------------------------------------------------------------------------
  */
 #include <ets_sys.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <os_type.h>
 #include <user_interface.h>
 #include <espconn.h>
diff --git a/targets/esp8266/gdbstub.c b/targets/esp8266/gdbstub.c
index 2f29cb3cc..5968309cd 100644
--- a/targets/esp8266/gdbstub.c
+++ b/targets/esp8266/gdbstub.c
@@ -14,7 +14,7 @@
 #include "gpio.h"
 #include "xtensa/corebits.h"
 
-#include "osapi.h"
+#include "osapi_release.h"
 #include "user_interface.h"
 #include "espmissingincludes.h"
 
diff --git a/targets/esp8266/i2c_master.c b/targets/esp8266/i2c_master.c
index 03a4828e6..b40ff5e17 100644
--- a/targets/esp8266/i2c_master.c
+++ b/targets/esp8266/i2c_master.c
@@ -33,7 +33,7 @@
  *
 *******************************************************************************/
 #include "ets_sys.h"
-#include "osapi.h"
+#include "osapi_release.h"
 #include "gpio.h"
 #include "espmissingincludes.h"
 
diff --git a/targets/esp8266/jshardware.c b/targets/esp8266/jshardware.c
index 59c2678b1..a073d7e46 100644
--- a/targets/esp8266/jshardware.c
+++ b/targets/esp8266/jshardware.c
@@ -14,7 +14,7 @@
  * ----------------------------------------------------------------------------
  */
 #include <ets_sys.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <os_type.h>
 #include <c_types.h>
 #include <user_interface.h>
diff --git a/targets/esp8266/jswrap_esp8266.c b/targets/esp8266/jswrap_esp8266.c
index fd0ac0781..a8c59383f 100644
--- a/targets/esp8266/jswrap_esp8266.c
+++ b/targets/esp8266/jswrap_esp8266.c
@@ -19,7 +19,7 @@
 #include <c_types.h>
 #include <user_interface.h>
 #include <mem.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <ping.h>
 #include <espconn.h>
 #include <espmissingincludes.h>
diff --git a/targets/esp8266/log.c b/targets/esp8266/log.c
index 6514b1fd8..f5c0c3b8e 100644
--- a/targets/esp8266/log.c
+++ b/targets/esp8266/log.c
@@ -1,7 +1,7 @@
 // Copyright 2015 by Thorsten von Eicken, see LICENSE.txt
 
 #include <user_interface.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <mem.h>
 #include <uart.h>
 #include <espmissingincludes.h>
diff --git a/targets/esp8266/osapi_release.h b/targets/esp8266/osapi_release.h
new file mode 100644
index 000000000..698b31836
--- /dev/null
+++ b/targets/esp8266/osapi_release.h
@@ -0,0 +1,6 @@
+#include <osapi.h>
+
+#ifdef RELEASE
+#undef os_printf
+#define os_printf(format, ...) do { } while(0)
+#endif
diff --git a/targets/esp8266/spi.h b/targets/esp8266/spi.h
index 2155a0521..9cf6b5617 100644
--- a/targets/esp8266/spi.h
+++ b/targets/esp8266/spi.h
@@ -15,7 +15,7 @@
 
 #include "spi_register.h"
 #include "ets_sys.h"
-#include "osapi.h"
+#include "osapi_release.h"
 #include "os_type.h"
 
 // Define SPI hardware modules
diff --git a/targets/esp8266/uart.c b/targets/esp8266/uart.c
index dd30a117e..3f7b0cb02 100644
--- a/targets/esp8266/uart.c
+++ b/targets/esp8266/uart.c
@@ -20,7 +20,7 @@
 #include "ets_sys.h"
 #include "osapi.h"
 #include "uart.h"
-#include "osapi.h"
+#include "osapi_release.h"
 #include "uart_register.h"
 #include "mem.h"
 #include "os_type.h"
diff --git a/targets/esp8266/user_main.c b/targets/esp8266/user_main.c
index dfb50f89e..dedcb9d99 100644
--- a/targets/esp8266/user_main.c
+++ b/targets/esp8266/user_main.c
@@ -15,7 +15,7 @@
  */
 
 #include <user_interface.h>
-#include <osapi.h>
+#include "osapi_release.h"
 #include <sntp.h>
 #include <uart.h>
 #include <espmissingincludes.h>