diff --git a/src/usbBlaster.cpp b/src/usbBlaster.cpp
index 2adaf06..97eb284 100644
--- a/src/usbBlaster.cpp
+++ b/src/usbBlaster.cpp
@@ -459,7 +459,7 @@ UsbBlasterII::UsbBlasterII(const std::string &firmware_path)
 	else
 		fpath = firmware_path;
 	fx2 = new FX2_ll(0x09fb, 0x6810, 0x09fb, 0x6010, fpath);
-	if (!fx2->read_ctrl(0x94, 0, buf, 5)) {
+	if (!fx2->read_ctrl(0x94, 0, buf, 5, 0x0000)) {
 		throw std::runtime_error("Unable to read firmware version.");
 	}
 	printInfo("USB-Blaster II firmware version: " + std::string((char *)buf));