diff --git a/src/cpu.rs b/src/cpu.rs
index 07ee848..c7edc21 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -353,7 +353,7 @@ impl<M: Bus> CPU<M> {
             (Instruction::JMP, OpInput::UseAddress(addr)) => self.jump(addr),
 
             (Instruction::JSR, OpInput::UseAddress(addr)) => {
-                for b in self.registers.program_counter.wrapping_sub(1).to_le_bytes() {
+                for b in self.registers.program_counter.wrapping_sub(1).to_be_bytes() {
                     self.push_on_stack(b);
                 }
                 self.jump(addr);