diff --git a/platformio.ini b/platformio.ini
index c82d8b4..82167f2 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -168,7 +168,7 @@ platform = ststm32
 board = nucleo_f411re
 framework = arduino
 lib_deps = ${env.lib_deps}
-build_flags = -std=c++17  -Os -g2
+build_flags = -std=c++17  -Os -g2 -Wunused-variable
 monitor_speed = 115200
 monitor_echo = yes
 
@@ -177,7 +177,7 @@ platform = ststm32
 board = nucleo_f446re
 framework = arduino
 lib_deps = ${env.lib_deps}
-build_flags = -std=c++17  -Os -g2
+build_flags = -std=c++17  -Os -g2 -Wunused-variable
 monitor_speed = 115200
 monitor_echo = yes