diff --git a/src/drivers/px4flow/px4flow.cpp b/src/drivers/px4flow/px4flow.cpp
index 0367985431..9c9c1b0f81 100644
--- a/src/drivers/px4flow/px4flow.cpp
+++ b/src/drivers/px4flow/px4flow.cpp
@@ -364,6 +364,9 @@ PX4FLOW::ioctl(struct file *filp, int cmd, unsigned long arg)
 			return OK;
 		}
 
+	case SENSORIOCGQUEUEDEPTH:
+		return _reports->size();
+
 	case SENSORIOCSROTATION:
 		_sensor_rotation = (enum Rotation)arg;
 		return OK;