diff --git a/src/debugger/gui/DrivingWidget.cxx b/src/debugger/gui/DrivingWidget.cxx
index cbfda65bd..1f6af768d 100644
--- a/src/debugger/gui/DrivingWidget.cxx
+++ b/src/debugger/gui/DrivingWidget.cxx
@@ -69,7 +69,7 @@ void DrivingWidget::loadConfig()
       break;
 
   myFire->setState(!myController.read(Controller::Six));
-  myGrayValue->setList(0, gray);
+  setValue();
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -82,13 +82,13 @@ void DrivingWidget::handleCommand(
       myGrayIndex = (myGrayIndex + 1) % 4;
       myController.set(Controller::One, (ourGrayTable[myGrayIndex] & 0x1) != 0);
       myController.set(Controller::Two, (ourGrayTable[myGrayIndex] & 0x2) != 0);
-      myGrayValue->setList(0, ourGrayTable[myGrayIndex]);
+      setValue();
       break;
     case kGrayDownCmd:
       myGrayIndex = myGrayIndex == 0 ? 3 : myGrayIndex - 1;
       myController.set(Controller::One, (ourGrayTable[myGrayIndex] & 0x1) != 0);
       myController.set(Controller::Two, (ourGrayTable[myGrayIndex] & 0x2) != 0);
-      myGrayValue->setList(0, ourGrayTable[myGrayIndex]);
+      setValue();
       break;
     case kFireCmd:
       myController.set(Controller::Six, !myFire->getState());
@@ -96,5 +96,13 @@ void DrivingWidget::handleCommand(
   }
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void DrivingWidget::setValue()
+{
+  int grayCode = ourGrayTable[myGrayIndex];
+  // * 8 = a nasty hack, because the DataGridWidget does not support 2 digit binary output
+  myGrayValue->setList(0, (grayCode & 0b01) + (grayCode & 0b10) * 8);
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 uInt8 DrivingWidget::ourGrayTable[4] = { 0x03, 0x01, 0x00, 0x02 };
diff --git a/src/debugger/gui/DrivingWidget.hxx b/src/debugger/gui/DrivingWidget.hxx
index b744bc13e..189e66baf 100644
--- a/src/debugger/gui/DrivingWidget.hxx
+++ b/src/debugger/gui/DrivingWidget.hxx
@@ -51,6 +51,8 @@ class DrivingWidget : public ControllerWidget
     void loadConfig() override;
     void handleCommand(CommandSender* sender, int cmd, int data, int id) override;
 
+    void setValue();
+
     // Following constructors and assignment operators not supported
     DrivingWidget() = delete;
     DrivingWidget(const DrivingWidget&) = delete;