diff --git a/driver-icarus.c b/driver-icarus.c
index df65cfdc..a6c6fb0e 100644
--- a/driver-icarus.c
+++ b/driver-icarus.c
@@ -367,7 +367,7 @@ static void icarus_initialise(struct cgpu_info *icarus, int baud)
 			// Enable the UART
 			transfer(icarus, CP210X_TYPE_OUT, CP210X_REQUEST_IFC_ENABLE,
 				 CP210X_VALUE_UART_ENABLE,
-				 icarus->usbdev->found->interface, C_PURGETX);
+				 icarus->usbdev->found->interface, C_ENABLE_UART);
 
 			if (icarus->usbinfo.nodev)
 				return;
diff --git a/usbutils.c b/usbutils.c
index aad0a407..b073a9e6 100644
--- a/usbutils.c
+++ b/usbutils.c
@@ -523,6 +523,7 @@ static const char *C_GET_AVALON_READY_S = "AvalonReady";
 static const char *C_AVALON_RESET_S = "AvalonReset";
 static const char *C_GET_AVALON_RESET_S = "GetAvalonReset";
 static const char *C_FTDI_STATUS_S = "FTDIStatus";
+static const char *C_ENABLE_UART_S = "EnableUART";
 
 #ifdef EOL
 #undef EOL
@@ -1007,6 +1008,7 @@ static void cgusb_check_init()
 		usb_commands[C_AVALON_RESET] = C_AVALON_RESET_S;
 		usb_commands[C_GET_AVALON_RESET] = C_GET_AVALON_RESET_S;
 		usb_commands[C_FTDI_STATUS] = C_FTDI_STATUS_S;
+		usb_commands[C_ENABLE_UART] = C_ENABLE_UART_S;
 
 		stats_initialised = true;
 	}
diff --git a/usbutils.h b/usbutils.h
index 9b2cf262..8b132b95 100644
--- a/usbutils.h
+++ b/usbutils.h
@@ -243,6 +243,7 @@ enum usb_cmds {
 	C_AVALON_RESET,
 	C_GET_AVALON_RESET,
 	C_FTDI_STATUS,
+	C_ENABLE_UART,
 	C_MAX
 };