diff --git a/src/emu/memory.c b/src/emu/memory.c
index 7ed53acad15..e55a97c1c9e 100644
--- a/src/emu/memory.c
+++ b/src/emu/memory.c
@@ -783,7 +783,7 @@ private:
 	template<typename _UintType>
 	_UintType watchpoint_r(address_space &space, offs_t offset, _UintType mask)
 	{
-		m_space.device().debug()->memory_read_hook(m_space, offset, mask);
+		m_space.device().debug()->memory_read_hook(m_space, offset * sizeof(_UintType), mask);
 
 		UINT8 *oldtable = m_live_lookup;
 		m_live_lookup = m_table;
@@ -836,7 +836,7 @@ private:
 	template<typename _UintType>
 	void watchpoint_w(address_space &space, offs_t offset, _UintType data, _UintType mask)
 	{
-		m_space.device().debug()->memory_write_hook(m_space, offset, data, 0xff);
+		m_space.device().debug()->memory_write_hook(m_space, offset * sizeof(_UintType), data, mask);
 
 		UINT8 *oldtable = m_live_lookup;
 		m_live_lookup = m_table;