diff --git a/src/emu/emumem.cpp b/src/emu/emumem.cpp
index 243adbc3aea..8ac780cb598 100644
--- a/src/emu/emumem.cpp
+++ b/src/emu/emumem.cpp
@@ -1672,7 +1672,7 @@ memory_region *memory_manager::region_containing(const void *memory, offs_t byte
 
 	// look through the region list and return the first match
 	for (auto &region : m_regionlist)
-		if (data >= region.second->base() && (data + bytes) <= region.second->end())
+		if (data >= region.second->base() && (data + bytes) < region.second->end())
 			return region.second.get();
 
 	// didn't find one