diff --git a/ci/build-arduino.sh b/ci/build-arduino.sh
index b6eb1bb..f251018 100644
--- a/ci/build-arduino.sh
+++ b/ci/build-arduino.sh
@@ -33,5 +33,5 @@ arduino-cli lib install Adafruit_VL53L0X
 # Compile all *.ino files for the Arduino Uno
 for f in **/*.ino ; do
     arduino-cli compile -b arduino:avr:leonardo $f
-    arduino-cli compile -b arduino:avr:leonardo --build-properties compiler.cpp.extra_flag=-DEBUG $f
+    arduino-cli compile -b arduino:avr:leonardo --build-property "compiler.cpp.extra_flag=-DEBUG" $f
 done