diff --git a/etc/sketch-arduino-cli.mk b/etc/sketch-arduino-cli.mk
index dc2393c6..26cbab0f 100644
--- a/etc/sketch-arduino-cli.mk
+++ b/etc/sketch-arduino-cli.mk
@@ -69,11 +69,11 @@ export SKETCH_FILE_PATH := $(firstword $(foreach dir,$(sketch_dir_candidates),$(
 
 export SKETCH_IDENTIFIER := $(shell echo "$${SKETCH_FILE_PATH}" | cksum | cut -d ' ' -f 1)-$(SKETCH_FILE_NAME)
 
-export SKETCH_BUILD_DIR := $(SKETCH_IDENTIFIER)/build
-export SKETCH_OUTPUT_DIR := $(SKETCH_IDENTIFIER)/output
+export SKETCH_BUILD_DIR ?= $(SKETCH_IDENTIFIER)/build
+export SKETCH_OUTPUT_DIR ?= $(SKETCH_IDENTIFIER)/output
 
-export BUILD_PATH := $(KALEIDOSCOPE_BUILD_PATH)/$(SKETCH_BUILD_DIR)
-export OUTPUT_PATH := $(KALEIDOSCOPE_OUTPUT_PATH)/$(SKETCH_OUTPUT_DIR)
+export BUILD_PATH ?= $(KALEIDOSCOPE_BUILD_PATH)/$(SKETCH_BUILD_DIR)
+export OUTPUT_PATH ?= $(KALEIDOSCOPE_OUTPUT_PATH)/$(SKETCH_OUTPUT_DIR)
 
 export LIB_PROPERTIES_PATH := "../.."
 
diff --git a/testing/makefiles/testcase.mk b/testing/makefiles/testcase.mk
index 8604ae7c..9ed60033 100644
--- a/testing/makefiles/testcase.mk
+++ b/testing/makefiles/testcase.mk
@@ -48,10 +48,10 @@ compile-sketch:
 	@echo "link"
 	install -d "${BIN_DIR}" "${LIB_DIR}"
 	env LIBONLY=yes \
-		  LOCAL_CFLAGS="'-I$(shell pwd)'" \
-		  OUTPUT_PATH="${LIB_DIR}" \
-			VERBOSE=${VERBOSE} \
-			ARCH=virtual DEFAULT_SKETCH=sketch \
+		LOCAL_CFLAGS="'-I$(shell pwd)'" \
+		OUTPUT_PATH="${LIB_DIR}" \
+		VERBOSE=${VERBOSE} \
+		ARCH=virtual \
 		$(MAKE) -f ${top_dir}/testing/makefiles/delegate.mk compile
 	g++ -o "${BIN_DIR}/${BIN_FILE}" \
 		-lpthread \