diff --git a/script/build/rpi-pico/serprog b/script/build/rpi-pico/serprog
index 15a20a22..dde5070e 100755
--- a/script/build/rpi-pico/serprog
+++ b/script/build/rpi-pico/serprog
@@ -36,6 +36,7 @@ main()
 
 	cd ${src_dir}
 	cmake -DPICO_SDK_PATH=${sdk_dir} .
+	make clean
 	make
 
 	mkdir -p ${serprog_release_dir}