diff --git a/platformio.ini b/platformio.ini
index 13431038f..10f753dc3 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -64,7 +64,7 @@ lib_ignore =
     ESP32SSPD
 
 ;https://github.com/platformio/platform-espressif8266/releases
-[env:esp01s_160mhz-2.7.4]
+[env:esp01s_160mhz_2_7_4]
 platform = espressif8266@2.6.2
 board = esp01_1m
 framework = arduino
@@ -87,7 +87,7 @@ lib_ignore =
     ESP32NetBIOS
     ESP32SSPD
 
-[env:esp01s_160mhz-2.5.2]
+[env:esp01s_160mhz_2_5_2]
 platform = espressif8266@2.2.0
 platform_packages = toolchain-xtensa@2.40802.200502
 board = esp01_1m