diff --git a/run b/run
index 1a69392..e0b812c 100755
--- a/run
+++ b/run
@@ -407,7 +407,7 @@ Extra options to append at the end of the emulator command line.
             memory = '{}B'.format(self.env['memory'])
             gem5_exe_args = self.sh.shlex_split(self.env['gem5_exe_args'])
             if do_trace:
-                gem5_exe_args.extend(['--debug-flags={}'.format(trace_type), LF])
+                gem5_exe_args.extend(['--debug-flags', trace_type, LF])
             extra_env['M5_PATH'] = self.env['gem5_system_dir']
             # https://stackoverflow.com/questions/52312070/how-to-modify-a-file-under-src-python-and-run-it-without-rebuilding-in-gem5/52312071#52312071
             extra_env['M5_OVERRIDE_PY_SOURCE'] = 'true'