diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f56ff2..48158df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,11 +166,15 @@ if(CMAKE_CROSSCOMPILING)
 
   # produce ASM listing
   add_custom_command(
-    TARGET firmware POST_BUILD COMMAND avr-objdump ARGS -CSd firmware > firmware.asm
-    )
+    TARGET firmware POST_BUILD
+    COMMAND ${CMAKE_OBJDUMP} -CSd firmware > firmware.asm
+  )
 
   # inform about the firmware's size in terminal
-  add_custom_command(TARGET firmware POST_BUILD COMMAND avr-size ARGS -C --mcu=atmega32u4 firmware)
+  add_custom_command(
+    TARGET firmware POST_BUILD
+    COMMAND ${CMAKE_SIZE_UTIL} -C --mcu=atmega32u4 firmware
+  )
   report_size(firmware)
 
   # generate linker map file