diff --git a/Makefile b/Makefile
index 4e5fa72..cacdc65 100644
--- a/Makefile
+++ b/Makefile
@@ -215,7 +215,7 @@ LIBS = c gcc hal phy pp net80211 wpa main lwip crypto
 # compiler flags using during compilation of source files
 CFLAGS	+= -Os -ggdb -std=c99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-inline-functions \
 		-nostdlib -mlongcalls -mtext-section-literals -ffunction-sections -fdata-sections \
-		-D__ets__ -DICACHE_FLASH -D_STDINT_H -Wno-address -DFIRMWARE_SIZE=$(ESP_FLASH_MAX) \
+		-D__ets__ -DICACHE_FLASH -Wno-address -DFIRMWARE_SIZE=$(ESP_FLASH_MAX) \
 		-DMCU_RESET_PIN=$(MCU_RESET_PIN) -DMCU_ISP_PIN=$(MCU_ISP_PIN) \
 		-DLED_CONN_PIN=$(LED_CONN_PIN) -DLED_SERIAL_PIN=$(LED_SERIAL_PIN) \
 		-DVERSION="$(VERSION)"