diff --git a/bytecode/concrete.py b/bytecode/concrete.py
index 2a43d1d..4b6dd9d 100644
--- a/bytecode/concrete.py
+++ b/bytecode/concrete.py
@@ -290,8 +290,7 @@ def _remove_extended_args(instructions):
             if instr.name == "EXTENDED_ARG":
                 nb_extended_args += 1
                 if extended_arg is not None:
-                    raise ValueError("EXTENDED_ARG followed " "by EXTENDED_ARG")
-                    extended_arg = (extended_arg << 8) + instr.arg
+                    raise ValueError("EXTENDED_ARG followed by EXTENDED_ARG")
                 else:
                     extended_arg = instr.arg