diff --git a/examples/lighting-app/esp32/sdkconfig_m5stack.defaults b/examples/lighting-app/esp32/sdkconfig_m5stack.defaults
index 95d805aa75b55e..be4c85a9c4bb14 100644
--- a/examples/lighting-app/esp32/sdkconfig_m5stack.defaults
+++ b/examples/lighting-app/esp32/sdkconfig_m5stack.defaults
@@ -65,3 +65,7 @@ CONFIG_RMT_SUPPRESS_DEPRECATE_WARN=y
 
 # Enable HKDF in mbedtls
 CONFIG_MBEDTLS_HKDF_C=y
+
+# Optimize IRAM
+CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH=y
+