diff --git a/etc/kaleidoscope-builder.conf b/etc/kaleidoscope-builder.conf
index de31a86b..ff0bfc0a 100644
--- a/etc/kaleidoscope-builder.conf
+++ b/etc/kaleidoscope-builder.conf
@@ -106,9 +106,8 @@ BOOTLOADER_PATH="${BOOTLOADER_PATH:-${BOARD_HARDWARE_PATH}/keyboardio/avr/bootlo
 
 
 
-ARDUINO_TOOLS_PARAM="-tools ${ARDUINO_TOOLS_PATH}"
-if [ -z "${ARDUINO_TOOLS_PATH}" ]; then
-    ARDUINO_TOOLS_PARAM=""
+if [ ! -z "${ARDUINO_TOOLS_PATH}" ]; then
+    ARDUINO_TOOLS_PARAM="-tools ${ARDUINO_TOOLS_PATH}"
 fi
 
 if [ ! -z "${AVR_GCC_PREFIX}" ]; then