diff --git a/src/add-ons/input_server/devices/mouse/MouseInputDevice.cpp b/src/add-ons/input_server/devices/mouse/MouseInputDevice.cpp
index 34551742f6..1ab78801dd 100644
--- a/src/add-ons/input_server/devices/mouse/MouseInputDevice.cpp
+++ b/src/add-ons/input_server/devices/mouse/MouseInputDevice.cpp
@@ -393,7 +393,8 @@ MouseDevice::_ControlThread()
 		nextTransferTime += kTransferDelay;
 #endif
 
-		if (ioctl(fDevice, MS_READ, &movements) != B_OK) {
+		if (ioctl(fDevice, MS_READ, &movements, sizeof(movements)) != B_OK) {
+			LOG_ERR("Mouse device exiting, %s\n", strerror(errno));
 			_ControlThreadCleanup();
 			// TOAST!
 			return;