diff --git a/src/apps/debugger/arch/Architecture.h b/src/apps/debugger/arch/Architecture.h
index 8d7ed43c60..998d3be7f4 100644
--- a/src/apps/debugger/arch/Architecture.h
+++ b/src/apps/debugger/arch/Architecture.h
@@ -114,6 +114,7 @@ public:
 
 	virtual	status_t			GetWatchpointDebugCapabilities(
 									int32& _maxRegisterCount,
+									int32& _maxBytesPerRegister,
 									uint8& _watchpointCapabilityFlags) = 0;
 
 
diff --git a/src/apps/debugger/arch/x86/ArchitectureX86.cpp b/src/apps/debugger/arch/x86/ArchitectureX86.cpp
index 54472477a7..bc2e075684 100644
--- a/src/apps/debugger/arch/x86/ArchitectureX86.cpp
+++ b/src/apps/debugger/arch/x86/ArchitectureX86.cpp
@@ -613,12 +613,13 @@ ArchitectureX86::GetInstructionInfo(target_addr_t address,
 
 status_t
 ArchitectureX86::GetWatchpointDebugCapabilities(int32& _maxRegisterCount,
-	uint8& _watchpointCapabilityFlags)
+	int32& _maxBytesPerRegister, uint8& _watchpointCapabilityFlags)
 {
 	// while x86 technically has 4 hardware debug registers, one is reserved by
 	// the kernel, and one is required for breakpoint support, which leaves
 	// two available for watchpoints.
 	_maxRegisterCount = 2;
+	_maxBytesPerRegister = 4;
 
 	// x86 only supports write and read/write watchpoints.
 	_watchpointCapabilityFlags = WATCHPOINT_CAPABILITY_FLAG_WRITE
diff --git a/src/apps/debugger/arch/x86/ArchitectureX86.h b/src/apps/debugger/arch/x86/ArchitectureX86.h
index b58be05f75..48e849c502 100644
--- a/src/apps/debugger/arch/x86/ArchitectureX86.h
+++ b/src/apps/debugger/arch/x86/ArchitectureX86.h
@@ -63,6 +63,7 @@ public:
 
 	virtual	status_t			GetWatchpointDebugCapabilities(
 									int32& _maxRegisterCount,
+									int32& _maxBytesPerRegister,
 									uint8& _watchpointCapabilityFlags);
 
 private: