diff --git a/platformio.ini b/platformio.ini
index 1d3ecc0..e9c268a 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -190,7 +190,7 @@ platform = espressif32 @ 6.7.0
 board = esp32dev
 framework = arduino
 lib_deps = ${env.lib_deps}
-build_flags = -std=c++17 -${env.build_flags}
+build_flags = -std=c++17 ${env.build_flags}
 monitor_speed = 115200
 monitor_echo = yes