diff --git a/avr-gcc-toolchain.cmake b/avr-gcc-toolchain.cmake
index 8217ef4..6f5e353 100644
--- a/avr-gcc-toolchain.cmake
+++ b/avr-gcc-toolchain.cmake
@@ -38,9 +38,6 @@ set(CMAKE_SIZE avr-size)
 
 
 # Define compile options
-#set(CMAKE_C_FLAGS_INIT "-mmcu=${AVR_MCU} -DF_CPU=16000000UL")
-#set(CMAKE_CXX_FLAGS_INIT "-mmcu=${AVR_MCU} -DF_CPU=16000000UL")
-#set(CMAKE_EXE_LINKER_FLAGS_INIT "-mmcu=${AVR_MCU}")
 set(CMAKE_C_FLAGS " -Os -mmcu=${AVR_MCU} -DF_CPU=${F_CPU}")
 set(CMAKE_CXX_FLAGS "-mmcu=${AVR_MCU} -DF_CPU=${F_CPU}")
 set(CMAKE_EXE_LINKER_FLAGS_INIT "-mmcu=${AVR_MCU}")