diff --git a/ROMFS/px4fmu_common/init.d/rc.interface b/ROMFS/px4fmu_common/init.d/rc.interface
index 928d3aeebc..d25f01dde0 100644
--- a/ROMFS/px4fmu_common/init.d/rc.interface
+++ b/ROMFS/px4fmu_common/init.d/rc.interface
@@ -33,7 +33,7 @@ then
 		tone_alarm $TUNE_OUT_ERROR
 	fi
 else
-	echo "[init] Mixer not defined
+	echo "[init] Mixer not defined"
 	tone_alarm $TUNE_OUT_ERROR
 fi