diff --git a/tools/x264_disable_mc_mul.py b/tools/x264_disable_mc_mul.py
index 7d22f47..01e83ca 100644
--- a/tools/x264_disable_mc_mul.py
+++ b/tools/x264_disable_mc_mul.py
@@ -1,8 +1,9 @@
 import os
 from pathlib import Path
-from subprocess import Popen
+from subprocess import Popen, run
 
 from speccpu import SPEC, check_bench_dir, find_build, get_benchspec_dir, x264
+from speccpu.flaglib.perf import record as recordflags
 
 
 def x264_disable_mc_mul(
@@ -38,18 +39,37 @@ def x264_disable_mc_mul(
     # Execute that new binary
     x264.update_exe(recompiled_x264_path, x264_dir / "exe")
 
-    with Popen(
-        spec.mkcmd_runcpu(
-            spec_config,
-            ["x264_s"],
-            setprocgroup=True,
-            workload="ref",
-            output_root=spec_outputroot,
-            build_type=SPEC.BuildType.Nobuild,
-        ),
-        env=spec_env,
-    ) as process:
-        process.wait()
+    x264_run = x264_dir / "run" / "run_base_refspeed_mytest-m64.0000"
+
+    def runcpu():
+        return Popen(
+            spec.mkcmd_runcpu(
+                spec_config,
+                ["x264_s"],
+                setprocgroup=True,
+                workload="ref",
+                output_root=spec_outputroot,
+                build_type=SPEC.BuildType.Nobuild,
+            ),
+            env=spec_env,
+            encoding="utf-8",
+        )
+
+    run(
+        [
+            "perf",
+            "record",
+            *recordflags(
+                [
+                    str(x264_run / "x264_s_base.mytest-m64"),
+                    *x264.specinvoke_args["ref"],
+                ],
+                output=str(Path() / "x264.perf"),
+            ),
+        ],
+        check=True,
+        cwd=x264_run,
+    )
 
 
 def main():