diff --git a/platformio.ini b/platformio.ini
index b32f365..da29e98 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -9,7 +9,7 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [platformio]
-build_dir = .\firmware
+build_dir = firmware
 
 [env:full]
 platform = espressif32