diff --git a/src/speccpu/__init__.py b/src/speccpu/__init__.py
index 3e01cac..116548a 100644
--- a/src/speccpu/__init__.py
+++ b/src/speccpu/__init__.py
@@ -1,4 +1,5 @@
 import copy
+import enum
 import os
 from collections.abc import MutableMapping
 from pathlib import Path
@@ -99,6 +100,11 @@ class SPEC:
     def env(self):
         return create_spec_env(self.dir)
 
+    class BuildType(enum.Enum):
+        Default = "default"
+        Nobuild = "nobuild"
+        Rebuild = "rebuild"
+
     def mkcmd_runcpu(
         self,
         config: str,
@@ -106,6 +112,7 @@ class SPEC:
         setprocgroup: bool = True,
         workload: str = "ref",
         output_root: Path | None = None,
+        build_type: BuildType = BuildType.Default,
     ):
         return [
             "runcpu",
@@ -116,6 +123,8 @@ class SPEC:
             config,
             *(["--output_root", str(output_root)] if output_root else []),
             *benchmarks,
+            *(["--nobuild"] if build_type == self.BuildType.Nobuild else []),
+            *(["--rebuild"] if build_type == self.BuildType.Rebuild else []),
         ]
 
 
diff --git a/test/test_spec.py b/test/test_spec.py
index b5579ea..d9d044b 100644
--- a/test/test_spec.py
+++ b/test/test_spec.py
@@ -80,6 +80,33 @@ class TestSPEC:
         assert "--output_root" in cmd
         assert str(output_dir) in cmd
 
+    def test_mkcmd_runcpu_build_type_default(self):
+        """Test that mkcmd_runcpu doesn't add build flags with default build type."""
+        spec = SPEC(Path("/path/to/spec"))
+        cmd = spec.mkcmd_runcpu(
+            "myconfig", ["benchmark1"], build_type=SPEC.BuildType.Default
+        )
+        assert "--nobuild" not in cmd
+        assert "--rebuild" not in cmd
+
+    def test_mkcmd_runcpu_build_type_nobuild(self):
+        """Test that mkcmd_runcpu adds --nobuild flag with Nobuild build type."""
+        spec = SPEC(Path("/path/to/spec"))
+        cmd = spec.mkcmd_runcpu(
+            "myconfig", ["benchmark1"], build_type=SPEC.BuildType.Nobuild
+        )
+        assert "--nobuild" in cmd
+        assert "--rebuild" not in cmd
+
+    def test_mkcmd_runcpu_build_type_rebuild(self):
+        """Test that mkcmd_runcpu adds --rebuild flag with Rebuild build type."""
+        spec = SPEC(Path("/path/to/spec"))
+        cmd = spec.mkcmd_runcpu(
+            "myconfig", ["benchmark1"], build_type=SPEC.BuildType.Rebuild
+        )
+        assert "--rebuild" in cmd
+        assert "--nobuild" not in cmd
+
 
 class TestCheckBenchDir:
     def test_valid_bench_dir(self, tmpdir):
diff --git a/tools/x264_disable_mc_mul.py b/tools/x264_disable_mc_mul.py
index b8fc190..7d22f47 100644
--- a/tools/x264_disable_mc_mul.py
+++ b/tools/x264_disable_mc_mul.py
@@ -45,6 +45,7 @@ def x264_disable_mc_mul(
             setprocgroup=True,
             workload="ref",
             output_root=spec_outputroot,
+            build_type=SPEC.BuildType.Nobuild,
         ),
         env=spec_env,
     ) as process: