diff --git a/platformio.ini b/platformio.ini
index 51d4fbd78..c98d3438f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -17,10 +17,10 @@ core_build_flags =
   -D NDEBUG
   -D ARDUINO_ARCH_ESP32=1
   -D ESP32=1
-  -std=gnu++17
+  ; -std=gnu++17
 
-core_unbuild_flags = -std=gnu++11
-; core_unbuild_flags =
+; core_unbuild_flags = -std=gnu++11
+core_unbuild_flags =
 
 ; my_build_flags is set in pio_local.ini
 my_build_flags =