diff --git a/src/cpu.rs b/src/cpu.rs
index d9fb588..6f0e28b 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -538,6 +538,7 @@ impl I8080 {
                 }
                 Opcode::Mvi(dst) => {
                     self.regs[dst] = data;
+                    self.pc += 1;
                 }
                 Opcode::Lxi(_) => {
                     self.z = data;