diff --git a/src/core.rs b/src/core.rs
index 2596441..350db31 100644
--- a/src/core.rs
+++ b/src/core.rs
@@ -78,7 +78,7 @@ impl Core {
                     }
                 }
             } else {
-                eprintln!("Invalid Instruction {:08x}", instr.0);
+                eprintln!("Invalid Instruction {:08x} at PC: {:x}", instr.0, self.pc);
                 break;
             }
         }