diff --git a/src/io/piiodevice.cpp b/src/io/piiodevice.cpp
index 91ba9570..2b03f7d9 100755
--- a/src/io/piiodevice.cpp
+++ b/src/io/piiodevice.cpp
@@ -330,7 +330,7 @@ void PIIODevice::splitFullPath(PIString fpwm, PIString * full_path, DeviceMode *
 			if (o == "br" || o == "blockr" || o == "blockread" || o == "blockingread")
 				op |= BlockingRead;
 			if (o == "bw" || o == "blockw" || o == "blockwrite" || o == "blockingwrite")
-				op |= BlockingRead;
+				op |= BlockingWrite;
 			if (o == "brw" || o == "bwr" || o == "blockrw" || o == "blockwr" || o == "blockreadrite" || o == "blockingreadwrite")
 				op |= BlockingRead | BlockingWrite;
 		}