diff --git a/make.py b/make.py
index b0d3967d7..2d1c51b3f 100755
--- a/make.py
+++ b/make.py
@@ -5,6 +5,7 @@ import os
 import argparse
 import subprocess
 import struct
+import shutil
 
 from mibuild.tools import write_to_file
 from migen.util.misc import autotype
@@ -136,7 +137,8 @@ CPU type:  {}
         actions["build-headers"] = True
 
     if actions["clean"]:
-        subprocess.check_call("rm -rvf build/*", shell=True) # Need shell for the build/* globbing
+        shutil.rmtree("build") # Need shell for the build/* globbing
+        os.mkdir("build")
         subprocess.check_call(["make", "-C", os.path.join("software", "libcompiler-rt"), "clean"])
         subprocess.check_call(["make", "-C", os.path.join("software", "libbase"), "clean"])
         subprocess.check_call(["make", "-C", os.path.join("software", "libnet"), "clean"])