diff --git a/MC6809/src/mc6809.cpp b/MC6809/src/mc6809.cpp
index de8b8cd..afd6c2c 100644
--- a/MC6809/src/mc6809.cpp
+++ b/MC6809/src/mc6809.cpp
@@ -579,11 +579,11 @@ void EightBit::mc6809::execute11(const uint8_t opcode) {
 //
 
 void EightBit::mc6809::push(register16_t& stack, const uint8_t value) {
-	BUS().write(stack--, value);
+	BUS().write(--stack, value);
 }
 
 uint8_t EightBit::mc6809::pop(register16_t& stack) {
-	return BUS().read(++stack);
+	return BUS().read(stack++);
 }
 
 //