diff --git a/libs/main/io_devices/piserial.cpp b/libs/main/io_devices/piserial.cpp
index 13d66f64..0adb790f 100644
--- a/libs/main/io_devices/piserial.cpp
+++ b/libs/main/io_devices/piserial.cpp
@@ -889,7 +889,9 @@ ssize_t PISerial::readDevice(void * read_to, ssize_t max_size) {
 	return PRIVATE->readed;
 #else
 	if (!canRead()) return -1;
-	if (!PRIVATE->event.wait(fd)) return -1;
+	if (isOptionSet(PIIODevice::BlockingRead)) {
+		if (!PRIVATE->event.wait(fd)) return -1;
+	}
 	ssize_t ret = ::read(fd, read_to, max_size);
 	if (ret < 0) {
 		int err = errno;