diff --git a/Processors/65816/Implementation/65816Implementation.hpp b/Processors/65816/Implementation/65816Implementation.hpp
index b980bbe73..be305499a 100644
--- a/Processors/65816/Implementation/65816Implementation.hpp
+++ b/Processors/65816/Implementation/65816Implementation.hpp
@@ -69,7 +69,7 @@ template <typename BusHandler, bool uses_ready_line> void Processor<BusHandler,
 					memory_lock_ = false;
 
 					// Reenforce the top byte of S if applicable.
-					registers_.s.halves.high = stack_address();
+					registers_.s.full = stack_address();
 				} continue;
 
 				case OperationDecode: {