diff --git a/airrohr-firmware/platformio.ini b/airrohr-firmware/platformio.ini
index f6b1fef4..567b5f72 100644
--- a/airrohr-firmware/platformio.ini
+++ b/airrohr-firmware/platformio.ini
@@ -28,7 +28,7 @@ build_flags =
   -D LWIP_DNS_ADDRTYPE_DEFAULT=3
   -D HTTPCLIENT_1_1_COMPATIBLE=0 -D NO_GLOBAL_SERIAL=0
   -DNDEBUG -DFP_IN_IROM -frandom-seed=b61f78373
-  -O3
+  -O2
 
 build_flags_esp32 =
   -DPIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY