diff --git a/src/dos/dos_devices.cpp b/src/dos/dos_devices.cpp
index 79d00eae..1936fe10 100644
--- a/src/dos/dos_devices.cpp
+++ b/src/dos/dos_devices.cpp
@@ -37,8 +37,7 @@ class device_NUL : public DOS_Device {
 public:
 	device_NUL() { SetName("NUL"); };
 	virtual bool Read(Bit8u * data,Bit16u * size) {
-		for(Bitu i = 0; i < *size;i++) 
-			data[i]=0; 
+		*size = 0; //Return success and no data read. 
 		LOG(LOG_IOCTL,LOG_NORMAL)("%s:READ",GetName());
 		return true;
 	}