diff --git a/radio/src/targets/simu/backlight_driver.cpp b/radio/src/targets/simu/backlight_driver.cpp
index fcb70cc72..f6b37f280 100644
--- a/radio/src/targets/simu/backlight_driver.cpp
+++ b/radio/src/targets/simu/backlight_driver.cpp
@@ -19,6 +19,7 @@
  * GNU General Public License for more details.
  */
 
+bool isBacklightEnabled() { return false; }
 void backlightEnable(unsigned char) {}
 void backlightEnable(unsigned char, unsigned char) {}
 void backlightDisable() {}