diff --git a/dosbox-0.74/src/debug/debug.cpp b/dosbox-0.74/src/debug/debug.cpp

index 118bb84..547f885 100644

--- a/dosbox-0.74/src/debug/debug.cpp

+++ b/dosbox-0.74/src/debug/debug.cpp

@@ -78,11 +78,11 @@ Bit32u GetHexValue(char* str, char*& hex);

 class DebugPageHandler : public PageHandler {

 public:

-	Bitu readb(PhysPt /*addr*/) {

+	Bitu readb(PhysPt /*addr*/) { return -1;

 	}

-	Bitu readw(PhysPt /*addr*/) {

+	Bitu readw(PhysPt /*addr*/) { return -1;

 	}

-	Bitu readd(PhysPt /*addr*/) {

+	Bitu readd(PhysPt /*addr*/) { return -1;

 	}

 	void writeb(PhysPt /*addr*/,Bitu /*val*/) {

 	}