diff --git a/Processors/65816/Implementation/65816Implementation.hpp b/Processors/65816/Implementation/65816Implementation.hpp
index 4e542236f..7ac380c08 100644
--- a/Processors/65816/Implementation/65816Implementation.hpp
+++ b/Processors/65816/Implementation/65816Implementation.hpp
@@ -925,7 +925,7 @@ template <typename BusHandler, bool uses_ready_line> void Processor<BusHandler,
 	result += (a & mask) + (data_buffer_.value & mask);	\
 	partials += result & mask;							\
 	result -= ((result - carry) >> 16) & adjustment;	\
-	result &= (carry & ~(result >> 31)) | (carry - 1);
+	result &= (carry & ~(result >> 1)) | (carry - 1);
 
 	// i.e. add the next nibble to that in the accumulator, with carry, and
 	// store it to result. Keep a copy for the partials.