diff --git a/etc/sketch-arduino-cli.mk b/etc/sketch-arduino-cli.mk
index 05c63a76..fa391d9d 100644
--- a/etc/sketch-arduino-cli.mk
+++ b/etc/sketch-arduino-cli.mk
@@ -113,5 +113,5 @@ flash: compile
 
 
 %:
-	ARDUINO_DIRECTORIES_USER=$(ARDUINO_DIRECTORIES_USER) $(KALEIDOSCOPE_BIN_DIR)/kaleidoscope-builder $@
+	$(KALEIDOSCOPE_BIN_DIR)/kaleidoscope-builder $@