diff --git a/bin/kaleidoscope-builder b/bin/kaleidoscope-builder
index e09bb6f2..5643497e 100755
--- a/bin/kaleidoscope-builder
+++ b/bin/kaleidoscope-builder
@@ -87,10 +87,6 @@ _set_build_paths() {
 
 
 
-_absolute_filename() {
-	echo "$(cd "$(dirname "$1")" && pwd)/$(basename "$1")"
-}
-
 _find_sketch() {
 	if [ -z "${SKETCH_FILE_PATH}" ] || [ ! -f "${SKETCH_FILE_PATH}" ]; then
 	# Didn't find a sketch
@@ -185,13 +181,6 @@ cmd_disassemble() {
 	"${AVR_OBJDUMP}" -C -d "${ELF_FILE_PATH}"
 }
 
-cmd_clean() {
-	_set_up_environment
-	if [ -d "$OUTPUT_PATH" ]; then
-		rm -rf -- "${OUTPUT_PATH}"
-	fi
-}
-
 _set_up_environment() {
 	_find_sketch
 	_set_build_paths
diff --git a/etc/sketch-arduino-cli.mk b/etc/sketch-arduino-cli.mk
index 26cbab0f..201ff4c4 100644
--- a/etc/sketch-arduino-cli.mk
+++ b/etc/sketch-arduino-cli.mk
@@ -111,6 +111,9 @@ size-map: compile
 
 flash: compile
 
+clean:
+	rm -rf -- "${OUTPUT_PATH}/*"
+
 
 %:
 	$(KALEIDOSCOPE_BIN_DIR)/kaleidoscope-builder $@