diff --git a/src/aio.c b/src/aio.c
index c5fa0ce..c3fa81a 100644
--- a/src/aio.c
+++ b/src/aio.c
@@ -86,7 +86,7 @@ static void aio_get_fan_speed(libusb_device_handle *dev, uint16_t *speeds) {
 		req[1] = i;
 		if (aio_post(dev, 2, 6) != 0)
 			speeds[i] = UINT16_MAX;
-		speeds[i] = (uint8_t)(resp[4] << 8 | resp[5]);
+		speeds[i] = (uint16_t)(resp[4] << 8 | resp[5]);
 	}
 }