diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0cbeabad..f830e954 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,7 +19,7 @@ jobs:
     - run: make install-arduino-cli
     - run: make configure-arduino-cli
     - run: make install-arduino-core-avr
-    - run: make -j 2 smoke-sketches
+    - run: make smoke-sketches
   run-google-tests:
     runs-on: ubuntu-latest
     steps:
diff --git a/Makefile b/Makefile
index 15c1ca80..f8d16de3 100644
--- a/Makefile
+++ b/Makefile
@@ -114,7 +114,7 @@ smoke-sketches: $(SMOKE_SKETCHES)
 clean: 
 	rm -rf -- "testing/googletest/build"
 	rm -rf -- "_build"
-	@ARDUINO_DIRECTORIES_USER="$(ARDUINO_DIRECTORIES_USER)" $(KALEIDOSCOPE_BUILDER_DIR)/kaleidoscope-builder clean
+	@$(KALEIDOSCOPE_BUILDER_DIR)/kaleidoscope-builder clean
 
 $(SMOKE_SKETCHES): force
-	ARDUINO_DIRECTORIES_USER="$(ARDUINO_DIRECTORIES_USER)" $(MAKE) -C $@ -f  $(KALEIDOSCOPE_ETC_DIR)/sketch-arduino-cli.mk compile
+	$(MAKE) -C $@ -f  $(KALEIDOSCOPE_ETC_DIR)/sketch-arduino-cli.mk compile