diff --git a/source/Debugger/Debugger_Display.cpp b/source/Debugger/Debugger_Display.cpp
index 273d5dd7..73ed7b26 100644
--- a/source/Debugger/Debugger_Display.cpp
+++ b/source/Debugger/Debugger_Display.cpp
@@ -2024,8 +2024,8 @@ void DrawLine_AY8913_PAIR(RECT& rect, WORD& iAddress, const int nCols, int iFore
 
 		if (isMockingboardInSlot && iAddress <= 13)
 		{
-			BYTE data = MB.subUnit[subUnit].regsAY8913[0][iAddress];
-			DrawByte_AY8913(sText, iCol, iAddress, data, MB.subUnit[subUnit].nAYCurrentRegister[0]);
+			BYTE data = MB.subUnit[subUnit].regsAY8913[ay][iAddress];
+			DrawByte_AY8913(sText, iCol, iAddress, data, MB.subUnit[subUnit].nAYCurrentRegister[ay]);
 		}
 		else
 		{