diff --git a/apps/drivers/px4fmu/fmu.cpp b/apps/drivers/px4fmu/fmu.cpp
index 7b1f341b44..dc9e431e4a 100644
--- a/apps/drivers/px4fmu/fmu.cpp
+++ b/apps/drivers/px4fmu/fmu.cpp
@@ -477,6 +477,7 @@ PX4FMU::ioctl(file *filp, int cmd, unsigned long arg)
 	case MODE_HIL_8PWM:
 		/* do nothing */
 		debug("loading mixer for virtual HIL device");
+		ret = 0;
 		break;
 	default:
 		debug("not in a PWM mode");