diff --git a/platformio.ini b/platformio.ini
index aff4e4f5..d9a0e77c 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -45,7 +45,7 @@ monitor_speed = 115200
 board_build.f_cpu = 160000000L
 ; set frequency to 40MHz
 board_build.f_flash = 40000000L
-board_build.flash_mode = dio
+board_build.flash_mode = dout
 upload_resetmethod = ck
 build_flags = 
     -Wl,-Teagle.flash.4m2m.ld
@@ -67,7 +67,7 @@ framework = arduino
 monitor_speed = 115200
 board_build.f_cpu = 160000000L
 board_build.f_flash = 40000000L
-board_build.flash_mode = dio
+board_build.flash_mode = dout
 board_build.ldscript = eagle.flash.1m256.ld
 upload_resetmethod = nodemcu
 build_flags =
@@ -87,7 +87,7 @@ platform_packages = toolchain-xtensa@2.40802.200502
 board = esp01_1m
 framework = arduino
 monitor_speed = 115200
-board_build.flash_mode = dio
+board_build.flash_mode = dout
 board_build.ldscript = eagle.flash.1m256.ld
 upload_resetmethod = nodemcu
 build_flags =