diff --git a/platform.txt b/platform.txt
index 72915c027..09b53c6e6 100644
--- a/platform.txt
+++ b/platform.txt
@@ -12,7 +12,7 @@ compiler.tools.path={runtime.ide.path}/hardware/tools/esp8266/
 compiler.path={compiler.tools.path}xtensa-lx106-elf/bin/
 compiler.sdk.path={compiler.tools.path}sdk/
 
-compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH "-I{compiler.sdk.path}/include"
+compiler.cpreprocessor.flags=-D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ "-I{compiler.sdk.path}/include"
 
 compiler.c.cmd=xtensa-lx106-elf-gcc
 compiler.c.flags=-c -Os -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals -MMD -std=c99